Non-TE probe compensation

Hi folks!

Has anyone had any experience with non-TE compensated vario systems? From what I gather there're a few options out the

* There's the varios (and flight computers with integrated varios) like the CAI 302 and LxNav V7 that have electronic compensation as an option. Any others out there?

* There's also the Schuemann box. They are hard to come by so if anyone can share any experience with those that'd be much appreciated.

* And there's the diaphragm type total energy compensators like the PZL KWEC.

Any other options out there?

If you can share your thoughts and the pros/cons in your experience with each of these systems and how it compares to a system with a regular TE probe I'd be very thankful.

Cheers,

Ale.L (RL)