The shops are indeed clean, comfortable and hygienic. The meat are kept in controlled refrigerated environments and appear fresh, safe and professionally prepared.
An Xin promotes their meat as Pearl Pork (珍珠肉) which they claim are from accredited farms where the pigs are nourished with natural feeds that are free from beta agonist and antibiotics. They also boast of high quality control in their abattoirs and processes. You can watch their promo video here.
As far as I know, there are currently 8 outlets in the Klang Valley and Selangor - 4 in KL (OUG, Cheras, Kepong Baru and Sri Hartamas), 2 in Petaling Jaya (Taman Megah and Puchong) and 1 each in Subang Jaya and Rawang. The shop that I patronize is in Taman Megah on Jalan SS24/13.
An Xin also offers what they call free range pork, which are from pigs that not confined in pig pens but are allowed to run free. They are not unlike ayam kampung. They claim that the meat is leaner and tastier. This free range pork is about 30% more expensive. I have tried the free range pork and very honestly, I cannot taste the difference and I do not think it is worth paying the extra for it.
Besides pork, the shops also sell pork related products like ham, bacon, roast pork, sausages and sweet meat. The roast pork in the shop are limited and do not look so good. I have tried their ham and bacon, and I did not think they were very good. There are definitely better ham and bacon in other shops. So I confine myself to just buying pork in An Xin.
I believe I do get some degree of comfort from their pork.