Hi Mike,

I had a RC Allan electric gyro for 7 years.
It was the best. I was most confident with it. It was giving you
correct reading on all 3 axis, so you could look at one small area to
have your situation.
The problem was high current drain, and I had to watch a voltage meter
and clear the clouds before loosing it.
It also take some time till it is ready to be used (a minute or 2)

I moved to a new glider and last year installed TruTrak T&B.
This can be turned on all all the time - low power consuming.
It is ready in 1 second.
The problems with it that it is not full roll, it stops at a certain
bank. Normally for thermalling you would like to turn steeper.
It also not an horizon - make more stress on you. have to guess your
pitch by the speed reading.

Whatever you choose, you will need a lot of practice in small see
through clouds before trying the full gray.
BTW, it can be very dark inside. If that happens - level out.

Avron Tal