Now that I have had a chance to use it more, I'd like to modify my answer above.
Adblock works sometimes on my SGTS2.
On a major news site, it comes up normally most of the time, showing "block ads this site" with a check mark.
Sonetimes, however, it comes up on that site with ads, and when you look at the info, the "Block ads this site" is turned off and greyed out.
If you look at another thread I posted on this issue, it has 100 views and no responses.
Makes me think this app is no longer supported and now allows websites to decide when ads can be blocked.
It's still better than nothing, but if anyone knows of one that works or is supported I would be interested in hearing about it
Don't care how much it costs if it blocks ads all the time