G.skill exclusively here too. I have used easily over 30 kits of G.skill and I have only had 1 failure which allowed me to become acquainted with their excellent customer service and warranty. I emailed them for an RMA, got a reply in less than 5 minutes and then I filled out the form they sent me and sent it to them and they replied again in less than 10 minutes and got me an RMA number in under a day which is almost legendary. Also overclocking is not a warranty breaking act thankfully for their LIFE-TIME warranty.
When it comes to budget G.skill gives the best performance for the price and their compatibility is untouchable when compared to OCZ, Crucial, and Corsair which all have had more than a few compatibility problems.
When it comes to high end performance the G.skill Black PI series has never let me down. Comparing my old OCZ ReaperX 800 Mhz 4-4-3-15 2.1v and my G.skill Black PI 800 Mhz 4-4-4-12 1.8v in overclocking my results were amazing:
OCZ max overclock: 895 @ 4-4-3-15 2.2v
G.skill max overclock: 1048 @ 4-4-4-12 2.2v
The G.skill ran cooler as well. I finally settled on the highest overclock I could get at 2.1v which was 958 Mhz @ 4-4-4-12 compared to 812 @ 4-4-3-15 for the OCZ.