I started 50mg a week using Tren A on Friday (injected 1x per week). The reason I'm using A is that I don't want an overlap of half-lives like with the longer esters. I want 50mg a week to be 50mg a week, not like with E where if you pin weekly, 50mg is actually more than that by week 2 because the 2nd jab starts while there's around 25% of first injection still left. Also, by the time the next Friday comes around, the concentration In the blood is low to the point of almost clearing, then the next 50 is essentially 50 again. My research shows me A has a half life of 1 day, and E is 4.5 days - so that's the assumption on that part. I could probably get away with E every 10 days or so, A just allows me to 'getaway' quickly.
I've tried 200mg E before and, being an insomniac already, that dose made my sleeplessness intolerable. Thankfully in the 2 nights since I took A, I've slept like a baby, with no sides of note other than elevated HR (which I get from it anyway) and a little more sweating during the night. I expect this to stop as the ester begins clearing mid-week which is another reason I'm using A.
I should add that the main reason I'm using it is the anti-catabolic effect during dieting because of its high affinity for the glucocorticoid receptor unlike most AAS. I'm not using it with main intention as to grow, but I've no doubt that the dose would be more than enough - following on from what IIx said on the first page.