To be honest, from what I know from studying medicine, it seems pretty bogus to me. Increased risk of heart problems is a given, it does happen because guys are more at risk. T increases cholesterol, and RBC and lowers the good fats and raises the bad.
The way I look at it, it's not gaining a risk, it's having the risk I was meant to have. I have the risks my brother has. To let the issue of going on T be affected by the risk factors all guys face anyway seemed silly to me. I remember reading the forms I had to sign thinking, "Obviously I'm fine with this! It's the risk factors I should have always had! If I'd been born the right sex for my gender in the first place, then I'd have those risk factors already!"
It's important to note that it's nothing definite, it's only risk factors, and when it comes to T the risk factors are in relation to the increase in blood pressure, cholesterol, RBC, lipid changes, etc. These are all increases that can be minimised by simply being a healthy weight, eating healthy and doing a little exercise.