Yes Crucial is top stuff quality wise(one of the most rigoroust standards in testing) and warranty is great, You need to realize though that crucial ram is only mid level performance stuff.
If you want RAM with the same quality control standards as crucial, then that Company is CORSAIR. Keep in mind CORSAIR is not cheap stuff. Essentially you pay for the quality control. The high performance CRUCIAL of ram is CORSAIR.
Like I said before OCZ, MUSKIN, Twinx, are top performers like CORSAIR, but standard and quality wise they are not as Rigorous, yet not far behind. On thing to note is OCZ in the past 6 months has been producing sticks the same speed even faster then CORSAIR, but the quality is just under them still.(does not mean quality is bad, all these rams sticks are far superior to any generic crap, but in the anal sense. So for OCZ i give them an 8.5 for quality and CORSAIR+CRUCIAL a 10.