This is a great upgrade for home enthusiasts that has been in the works for a long time as JohnB mentioned.
The best things about HotTop IMO is their fine personal customer service from Michael and the simple user maintenance and serviceability. It is easy to literally take the unit apart to clean and replace parts as needed.
The downsides are chaff getting into every nook and corner of the machine, airflow and smoke leaks and as mentioned a bit underpowered. I generally use 170-175 gm loads to get optimal profiles (1C starting anywhere from 9-10 minutes at my discretion). Finally, I had to customize with bean temperature probe. The built in temperature probel is almost useless. This new unit seems to address the issues and hopefully the chaff and smoke issues too.