Dave Crampton

I find your post confusing. My first try dive was on the Inspo Classic. I had very little trouble with it, as the instructor had given me a nice brief on how to use it, for the purposes of the trydive. I didn't know about Min lung volume but over the hour I dived it it was fine, and venting through the cheeks, was very easy on the finishing ascent. The only new thing I found was the scilence and the lack of bouyancy adjustment with my lungs. Perhaps you read a lot up before hand and were expecting something else when you did the trydive.

Persevere and try several units until you find one which you are happy with after all, thats the purpose of a try dive isn't it?