This is what I use, too. Except I built it myself. Midwest sells replacement blades for the mix stir for $4. These and an aluminum rod from Home Depot plus a small SS bolt and lock nut will yield the same thing for less than $12 total.
Tried my first BIAB session this morning and re-plumbed the CO2 lines in my kegerator tonight. Also cleaned a few cornies while enjoying a Patersbier (from NB) that I brewed about 2 years ago.
Looks good! The step-by-step instructions on setting up the cooling system are really helpful! I hope to be doing something like this in the near future.