I own a Top Tier with three burners, two Boilermakers (one more on the way), a Therminator, AutoSparge, and BeerGun.
I have owned but no longer own a HopBlocker and ThruMometer.
The HopBlocker never worked great for me, so I parted ways with it. For containing pellet hops, I now use a
stainless basket from Stainless Brewing, which is terrific and is a better solution for me. The ThruMometer worked well but I moved on to a
digital set up which is a huge improvement due to the faster reaction time of the probe thermometer.
Everything else I own has been a pleasure to use, no real complaints. The Boilermakers and Therminator are awesome. My main beef is minor, but the heat shield included with the Boilermakers could have had some more thought put into it. It is awkward to use, and basically seems like an afterthought.
I am moving from a single-kettle-two-cooler set up to a three Boilermaker automated RIMS system. I still haven't decided if I am going to DIY or go with the Tower of Power ($$$$), I although I am leaning in the direction of the TOP.