Carol,(posted 8870 days ago)I buy PMK and TF-4 from PF. The TF-4 fixer is my favorite one, especially when I'm travelling and want to develop film on the road. TF-4 is a concentrate, packs easily, and mixes quickly (you don't have to dissolve powdered fixer in hot water and then wait till it cools down).
I've tried several of their film developer formulations, some with great success, others are frankly no better than the common, brand name counterpart. Some of the write-ups on their products can be a little optimistic, but, then again, maybe I just did not use the product long enough, or carefully enough.
Their little catalogue is very interesting to read and a wealth of information. Some of the chemicals they sell you cannot get elsewhere.
And, on the business side, I've never had any problem with PF.
Good luck, Sergio.