This is mostly about cream, not patch, but I think it is relevant.
I'm on AndroForte cream, scrotally applied. I feel that its effectiveness varies a great deal. I've researched it like crazy (as have a lot of people here - Frustrated1 is typical) and it seems that the absorption any transdermal, gel, cream or patch, is highly erratic. Combine that with a very low half-life, as it's straight T and not an ester, means that T levels vary wildly. (For me, anyway.)
I'm getting to read my body so much better, and I think I can predict my current T levels by how I feel.
Last week I hung off the cream for two days (yes, that is all!), I treated myself pretty badly and scored a T reading of 46 on the US scale. I wanted a second reading below 250 so I could be legally treated in Australia.
I then applied the cream three times in 24 hours, not two, and I was an animal in the gym. Seriously, I benched weight that I haven't done for twenty years. (It made me realise that the advice "Be careful - your ligaments are now the weak link" is true.)
HOWEVER: this did not last, and I believe my T levels are still around 250 at best, at the morning peak. Even rubbing cream into my nuts every chance I get doesn't raise my perceived T levels.
Summary: For me, transdermals suck.
Luckily my doctor now believes me and is calling me to come and see him. And I will be taking my shopping list which will include Test Cyp, HCG - and some HGH while I'm at it. May as well ask!
Oh yes: it appears to that the wild fluctuations you get from straight T, because of its very short half-life, lead to aromatisation. So I already have Aromatase inhibitor (AI), I just think I will need it less on a twice-weekly Test Cyp regime.