I also deal with Astrum via Dmitriy, and sometimes he replies in 24 hours, and sometimes it takes a few days, but he always replies.
Astrum offers quite a variety of interesting film stocks and I've sampled several. I was given a couple of sample rolls of Astrum films a year and a half ago and I was pleasantly surprised by them, so I ordered more from Astrum directly. In my experience many are "old school" emulsions akin to 1960s Kodak materials, so for someone looking for "the Tri-X/Plus-X experience" these films may be worth your time to explore. One thing I will say is this: if you buy the Astrum Foto 400 (35mm pre-loaded cassettes), be aware that it is the thinnest polyester film base I have ever seen. This film will be very difficult to load in a Paterson self-loading plastic reel, I would think (I only use steel), and its a challenge to get it into negative sleeves for storage as well. On the plus side, these Foto films dry FLAT, and with almost zero film + fog base density. My favorite is Astrum Foto 200, because its less coarse than the 400, but a stop faster than the 100, and it has lovely "old school" tonality.
Here is a sample image shot on Astrum Foto 100, 35mm film, processed in Rodinal:
https://live.staticflickr.com/1818/44124451431_b7bb9518d2_k.jpg