The modular nature of the Thermaltake Core V21 makes it an excellent candidate for those looking to do their first custom paint job, for the sheer fact that you would not have to drill out any of the rivets. For those looking to go the open liquid cooling route, I would put this in the intermediate class (those that have previously installed a open loop in either a Full or Mid-Tower at least twice). The modular radiator mounts are by far one of the most innovative ways I have ever seen for installing radiators. Its stackable ability will definitely make for some very interesting build combinations from super over the top liquid cooling systems to multiple gaming systems with their own dedicated server.
The only two short comings being the lack of cable management, but as mentioned earlier is really not the fault of the case but due to the length of the cables on the PSU (*hint*hint* PSU manufacturers/custom PSU cable makers), as well as the orientation of the cables on the SSD drive caddies. That is more of a personal opinion because I hate seeing cables. That being said the Thermaltake Core V21 is by far one of the most fun mATX cases on the market I have put a system into yet.[sc:must_have_award ]