hmmm it all really depends; granted I do like Metallica and my favorite Testament album is The Ritual (I don't like thier death metal attempts) however St. Anger wasn't really something great; I did like the song Some Kind Of Monster however I think Metallica should try to rework with the style they used for The Black Album; I would like to here that more as I detest most modern music (2000-Present). If they could do something to revamp the style of the Black Album then hell yes I would buy it... hell I think revamping the Load/Reload style would be awesome or the classical/metal combination used in Ride the Lightning ;...And Justice for All; S&M and by Yngwie but I didn't buy St. Anger and if they reload on the St. Anger sound then no I would not spend my money on it. As for downloading it depends; I would listen to the radio play first and if skeptical I will download 2 or 3 tracks so I can make a fair judgement on their current style of play (but if they go back to the trash metal style that would also be pretty cool).
Personally though I'm a rabid Alice in Chains fan so yeah... long live the Ritual