idk about the reviews, but I love my sp4. I spend 70% of my time on it, can do everything but heavy gaming on it no problem so I use it instead of my i7, 780gtx rig.
But I agree, very expensive, I got the i7, 16GB ram, 256GB drive version and not sure I'd appreciate anything under 8GB RAM, and lower than the i5. I got the i7 and additional RAM because I like running VM's on it, storage too expensive, but it has an SD slot and usb 3.0, so no problem throwing a 128GB microSD into it, or attaching usb drive.
But I really wanted a truly mobile solution to my desktop for purely work type stuff when not at home(and heavy laptop just wasn't working it for me), which sp4 works amazing at. Still a few weird bugs every once in awhile, but I just hold power down and then start it back up, 30s process, and im back working. Battery lasts my the 8 hrs im at work doing office work, if you are pushing it hard, I think its closer to 4-6 hrs. Fan only on when doing really hard work or gaming, but not that loud, and never too hot to hold, just gets warm. My VM's are plenty responsive, keyboard works good, almost instant startup, benches 7zip faster than the dual dualcore 3.2Ghz xeon proliant server in my basement(pretty old server but still nice).
I bite the bullet but worth it tbh. I don't know how nice the clones are