I feel like a champ on 500mg test a week. There is a very noticeable difference for me compared to 250 ew which I have run as well.
I sleep better and feel calmer in general. I recover WAAAAY the fuck faster from training and my protein utilization goes up a cubic assload. I get routine daily farts eating 200-250grams protein when natural. Hell a meal with 50grams protein will give me a couple nasty ones.
On 500mg ew I could probably eat 400grams protein a day np.
The only noticeable sides I have gotten off 500mg test is that I do sweat a little bit at night, but not while I sleep. This is probably the high androgen level and typically occurs around the shoulders/upper chest. Doesn't particularly bother me. I also keep an eye on my salt intake and try not to consume caffeine more than once a day. That's about it.