I did some simple tests tonight using the “free” rainbow tables that come with Ophcrack. I was expecting at least one of my passwords to be cracked but neither were. I think there were a couple reasons for this
The password on my XP machine is 15 characters – Ophcrack only goes up to 14 with the free tables for XP
The password on my Windows 7 machine is not in the dictionary – Ophcrack only uses a “based on dictionary” hybrid table with the free tables for Vista+
The good thing here is that for the “trivial” user, they won’t be able to get my passwords since the non-free tables go for $99 a piece or they’ll need to obtain other tables online.
So is it Ophcrack crap? No, probably not, that would be a little harsh since I bet the free tables would crack a huge majority of the general public’s passwords.