Д.Д., the only AVA recording I have is the duo with Harry Tavitian, and it is a CD (not a CDR), but this one was released before burning CDs on your own became the commodity it is today...
Considering your warning, I am no more sure about how to act now: The AVA catalogue seemingly is full of hidden gems, and in fact I already have ALL of Vapirov's Leo releases (plus one on the Russian Solyd label)... Anatoly Vapirov immediately replied to my e-mail, saying that if I order 5 to 7 CDs, postage will be around €20, which is quite expensive (much higher than postage for airmail deliveries from the USA or Japan). And in addition, there probably will be considerable bank charges for transfering money to a Bulgarian account. You have any experience with paying that way, Д.Д.? And there really isn't a less costly method of paying? And finally, what about customs/VAT?
I already made a personal selection of six CDs I'd like to order from AVA (among them the sax quartet you mentioned and a duo with Vladimir Tarasov). But, hmm, the risk of paying lots of money for defective CDRs somewhat discourages me...
Not that I am opposed to CDRs in general: I own the complete Duns catalogue (Paul Dunmall's CDR label) which is 43 CDRs (including two 4-CD sets and one twofer) up to the present day. There were Duns CDRs with minor defects, but Paul instantaneously replaced those by faultless ones. But hey, this is England, not Bulgaria!