Not to be a party pooper, but I can tell you honestly, a plate chiller is very hard to keep clean. I used one for almost five years (shirron and then a therminator) and they are nearly impossible get completely clean without tons and tons of backflushing (both ways), soaking, etc.
That said, I never had an infection either, so its not like its a high risk, but that drawback is definitely real, so much so that it caused me to give up on them when considered in conjunction with the hassle of using them as well.