Sager NP8258-S worth it?

Alright. I have owned a SAGER P8170 laptop before with similar specs.

Getting the Bigfoot Networks Killer™ Wireless-N was my biggest regret. The connection was laggy (spikes) and it would temp-disconnect me every few seconds, due to the chip being Wireless-N, which made online gaming for me impossible. I believe this problem happened to me because of the previous router that I had (it didn't have support for Wireless-N). Check here: https://encrypted.google.com/#q=bigfoot+killer+wireless+disconnect

Unfortunately for me it did not last 10 months, but that's probably because I forgot to apply thermal paste to both my GPU and CPU after I cleaned them, thus caused my GPU to overheat and eventually die (Kept it alive for 3 months using the oven method, and trust me, you don't want to end up doing the oven method!)

My favorite thing about the laptop was the Fn+1 function that will run all your laptop fans at 100% speed, for safe heavy gaming without fear of overheating, but it can get noisy. Also, the 17" screen I had was beautiful, better than all the WinOS laptop screens I've seen, that's for sure! (I got it calibrated by XoticPC)

The trackpad wasn't actually that bad, but then again I rarely used it. It was functioning as expected and that's what mattered to me.

GTX 880 benchmarks: http://www.notebookcheck.net/NVIDIA-GeForce-GTX-880M.107622.0.html
Looking at the benchmarks I don't see you having any problems at running the upcoming games at ultra settings. It's a beast of a card, no questions asked!

Yepp. And yes, I'm 100% sure it's because my GPU was running without a thermal paste. Heh, I don't know how I'd forget such a thing..

as long as you remember your thermal paste there shouldn't be a problem, clevo/sager are notorious for bang for your buck.
the issue with a bad track pad shouldn't even correlate to gaming, I don't know anyone that hasn't got a seperate gaming mouse - if you want a decent all rounder that's good for the money look up the anker 8200.
aside from that the build looks solid.
if you're in the tropical climate then maybe invest another $50 in a cooling stand, its best to be safe as these things do get really hot, and the outside heat ain't going to help.
as far as the 880M lasting? for 1080p gaming it'll easily last 4 years, 720p even longer. maybe double

You'll be fine. Linksys E1200 is a Wireless-N router.

Yes.

track pads are fine for surfing, but when you need quick precision like gaming then you're going to really want a gaming mouse.

Indeed it is, but it fit inside nonetheless (I had the NP8170).

I recently got the 8258-S with the 880M card in it.

The touchpad is finicky, but if you open up the config driver and tweak the settings (I have cursor speed to 10, paging set to 3, disabled pinch to zoom in/out), then the touchpad becomes enjoyable. Otherwise, it's far too picky out of the box in the default config.

The fan is remarkably quiet for a gaming laptop. I know Sagers get bashed for loud fan noise, but whatever was changed, has made the fan fairly quiet all considered. Yes, when the fan is on max, it's noticeable, but not anymore than the Asus 17" gaming rig. In fact, for noise level, I'd classify it right up with the Asus, which are fairly well known for being quiet running laptops.

For cooling, I've rarely had it going over 84c for the video, and the cpu's have never gotten over 78c.

I am still getting a laptop cooler though just for peace of mind, and the fact a cooler running laptop adds years to the life.

To answer your questions:

1. The build quality is excellent. The keyboard is solid, has a good tactile, and it can handle my 160wpm (92% accuracy) just dandy without ghosting or dropping keys. The monitor is brilliant. The sound quality for a 2.1 systems is very loud, and has no issues pounding out good clear sound. All in all, a very well rounded and well built system.

2. The trackpad once you tweak the settings is actually enjoyable. The issue is the default settings blows goats. Once the settings are made, the trackpad is nearly identical for precision to asus, msi, or such touchpads.

3. I can't say personally, but after tons and tons of research, I went to Sager. My last laptop was an asus, which while well made, had issues with overheating for extended game play. So far, the Sager has not.

4. How does playing Witcher 2 in ultra getting over 60 fps sound? I could do uber, but why bother? I've basically have tried every game at max settings and it chews through them all. I find the 880M's performance lands between the desktop 680 GTX and the 780 GTX in real world testing. Short of games that require high-end desktop SLI mode video (which frankly are far between, and only when you want the uber insane graphics that few if any can tell the difference on) it will play everything with well over 30 fps. LIkely you'll hit 60+fps for most games on ultra.

since you live in the philippines, get a laptop cooler. The sager can likely keep it cool anyway, but why risk it.