I've never used 1-testosterone, but I'm very experienced with 1-AD (its prohormone). You can still buy 1-AD in the UK.
1-AD is a good dry bulker. However, it does cause you to drink and pee quite a lot, and I heard that 1-test is the same. On 1-AD, I wake up in the middle of the night, every night, to go to the bathroom. Never had any mpb / gyno issues - the structure of 1-test cleverly sidesteps enzymatic conversion. It does shut you down, though, so I recommend some testosterone with it.
One other thing. I read lots of reports in the past that 1-test cypionate is quite an irritating injection. I'm fairly happy getting 1-test from 1-AD. Its unmethylated, but much of it survives first pass due to a double bond in the same position as in primobolan.
I'm surprised 1-test isn't talked about more, because its a very clever steroid.