Protomax, questions answered in order:
Protomax is a dry compound
It's supposed to be less harsh on the liver than other methyls (according to PA if I remember correctly)
Sides are mild from the logs I read.
Gains seem to be dose-dependent. I believe bulking guys got about 10 lbs off it.
Strength- unsure. Need to read logs again, it was a while ago. It's a steroid, so you will definitely see some strength gains.
As far as comparing it to H-drol, the similarities seem to end with dosing protocols. Different compounds, different effects. H-drol is a great compound that's loved by a lot of people, and protomax simply hasn't been around long enough to garner the same following. If you decide to use it, please do us all a favor and log it, there need to be more logs of the stuff!