I still get a little nervous (without the comforting sound/size of a real heatsink/fan), but I have been extremely happy with my self contained water cooling. It's low profile, so any airflow system you have for your GPUs is going to be much better. Not to mention it cuts a good 20 dBs off your case. I do get paranoid from time to time that it's not working though, since it's so quiet.