I am considering buying my first sub (probably used from ebay) and I like the small size and black gloss appearance of the hgs line (they would match the appearance of my nht 3.3s and 2.5s). The room size is about 15'x15' (apartment), so I don't want anything too large. I've heard (and been impressed) by both in different stores, but have been unable to do an a/b test. Has anyone bought an hgs10 and felt they had to upgrade to an hgs12? Any comments welcome. ps: I'm using the start of side 2 of das boot for the demo - you really hear/feel what you are missing without a sub (pun intended).