I think their stuff is ok - I originally bought a composer collection with Gold versions of HW Strings, Woodwind and Brass, and plus QL Pianos Gold, and a few others. And it all worked well enough, for me.
However, once I bought Komplete Ultimate and had access to Kontakt (and could therefore buy all the great Kontakt libraries out there), I really started using EastWest stuff less and less. Kontakt is usually the first thing I load up, nowadays, and I find myself turning to Play much less often, and only for very specific things. The only EW libraries that get any real use are HW Strings Gold and Stormdrum 2 & 3.
As for customer service, I've had a few technical issues that were cleared up quickly and efficiently. I personally have had no issues with their customer service.
The new cello is okay-ish, but I expected better from EW. I toyed around with some piano/cello stuff last night, just to see how it worked into a mix, and compared it with the two other cellos I have in my collection (Tina Guo Legato Cello by Cinemsaples, and the free Blakus pocketCello), and the EW one came in last. It was basically useable, but I think its telling that the Blakus pocketCello freebie -- a small throwaway library made by a dude who isn't a professional sample creater (from what I can tell, anyway) -- produced better results than the library by the pros at EW. The Cinesamples worked best for me, and it remains my goto for expressive solo cello lines.
I do have a question for those of you who have the Solo Cello from EW: last night I came across a sample that sounds pretty bad (to my ears, anyway). If you load up the "Solo Cello Leg Slur.ewi" patch, in the "05 Legato" folder, and play the sample for B-2 (the B natural found one octave below middle C / C3), do you hear some sort of audio artifact in it? There is a discordant sound about a half second into the sample -- maybe the bow scraping, or something similiar. It caught my attention last night. Does anyone else hear this?
Thanks,
Rob