I've had both a Therminator and Shirron over the years. I sold both of them - was never happy with cleaning them - the small channels and dozens of bends leave plenty of places for debris to collect. I backflushed once iwth over 100gal of water (blast on/blast off) and was still unable to get the Therminator fully clean. I went back to a large diameter IC for my current rig, but in my new electric system, I am planning on a double ganged CFC (one with hose water, one with recirculating icewater).
Looks like you live in MN so you should have great performance with either unit.
I would recommend spending the coin on some SS QDs - those 4 connections can be a pain sometimes, especially if you've been doing other things and forgot to hook up the chiller!