I'm hooked the same way... pneumatic to winter vario, electronic to S80. I like that one 'backs up' the other in case of a failure. It removes the issues associated with splitting TE line to two sources (as covered by a bunch of historical posts), and when you have two independent instruments with independent 'sensors' telling you the same thing, it reinforces the information being delivered. I'm surprised how closely they match up. I have yet to find the need to tweak the electronic compensation, but I suppose that is another reason to have that option if you find it useful.