Well, whether their bootlegs or not, they keep planning to issue these types of CDs. I found out the following are coming out in December:
OUTSTANDING METAL GEMS VOL 009 - HAMMERWITCH / TROP FERROS / CASSLE
OUTSTANDING METAL GEMS VOL 016 - MASQUE / STREAM / GRAND BITE
OUTSTANDING METAL GEMS VOL 017 - AVALON - WYXMER - THOR (ARG)
OUTSTANDING METAL GEMS VOL 018 - PARASITE - WILLD PUSSY - WIDOW (uk)
Personally, I think this is awesome. Up til now, crappy CDRs have been the only way to get a lot of this stuff. I finally got some in from a russian mail order company, and this stuff is top notch, and in fact, better then most legit reissues coming out (if they are in fact boots).