HS11 - Plastic lever, and body. If i'm not mistaken. Less power then the HS33 from what i've felt of them. Not as nice feeling on the lever. Feels spongier, and just horrible really. Not a TPA like the HS33's, as said before, they have an allen key bolt to adjust lever pull. The calipers (bits the pads are on) are the same on each brake. It's only the levers that are different on the two models. So whoever it was talking about needing new ones because of the 'bodge' job, no need to change. You'll be replacing the exact same thing. HS33 04 - Again, same calipers, different lever. In my opinion (and many others ) the 04 levers feel much nicer compared to the 05+ ones. The TPA's brake, but there's a simple bodge, that I have successfully used. The lever blade feels nicer on the fingers, they feel 'rounder' than the 05 levers. HS33 05 - As above. But a different lever. The TPA on these is in the lever blade (sorta ) than sitting on top like the 04s. I've seen a few people brake the clamps on the lever bodies, which isn't good. On the plus side, Deng's got a load of colourful lever blades for these. Umm..hope that answers any questions you may have on those..