We primarily use Art Leather and Asuka. Art Leather has insanely high shipping considering its being sent UPS Ground (like $15 for a little box of mats). The weight and the price dont line up. They have said they may lower their shipping rates. This past year Art Leather relocated their business on Long Island, NY to Hicksville. Their transition went well and we didnt have any orders affected.
Turn around time for AL is SLOW. Our primary product we were ordering from them on a reg. basis was the photo fun book, which has been discontinued. :o( Turn around time on that was about 6-8 weeks if we sent them the photos. Not sure how long if it was all done in house (Its a little board book, in case you havent seen one - heres a little shot)

Not sure if we will continue to use them. Their product is excellent, customer service is nice (for NYers) and helpful. We had a customer be relocated out of country during Christmas. They uped their shipping to FedEx Overnight at no charge to make sure it got here b4 she left town. I like their image box and their traditional albums are super posh.
Asuka Book - what can I say? They have impressed me. THey are faster than Art Leather and shipping from farther away. They are easy to use (in terms of uploading to them). They have a guideline template you can use, so you dont have to make your own. Their product is nice - especially their top of the line book. Its a good product at a good price. Plus they are supposed to be coming out with a leather album cover shortly. Cant wait to see that.
Asuka also called us once to check on our layout. I had a little image on the back cover go into their red feild - where the barcode goes. It was placed like that on purpose and just part of the cover design. Anyway a rep called to make sure it could go to print since and image would be affected by the barcode. I was shocked they called. They seem on top of things. Fast and friendly too.
We also use GraphiStudio occasionally. I love their books, but I've heard their CS stinks. So far, I havent had that issue. Our regional rep is ok and helpful. I have an order going into them shortly, so we'll see if we walk away issue free.
We've also ordered TAP products from Wooden Nickel, mostly things other than albums - like proof boxes or event folios. You get what you pay for - their stuff is nice looking, but not made to last a lifetime. Someone that has their albums may be more helpful specifically on albums.
There is a new company we are looking at from the trade show - konpoli. We are looking at them, mainly for something different. They have crystal embedded in leather covers and they looked really nice. So far I havent gotten my hands on a sample, besides seeing them at the show.
Hope that helps a little bit...