I just installed IH2 locally and everything is working fine. I'm just wondering how its cache works? Is it "intelligent" and uses the same cache for multiple visitors? I've checked the BMZ_CACHE and it seems to use the same cached images over and over again, but this is just locally and with one user - me. I recon bandwidth would be quite an issue if 10-20 visitor surfed the shop at the same time and IH2 cashed the images individually for each customer.
I bet it's not even an issue, but I want to be sure before going live.