Fit and style are great. But its very thin.
I understand summer weight, would be thin and lightweight. This shirt currently works great in the winter, under a sweater. It's actually pretty ideal. I'm not sure I'll be able to wear this in the summer however. The shirt is see-through. Without an undershirt, you can see chest hair, body parts, etc.. With an undershirt, all you can see is the undershirt and lines.
I'm 6'3" and 200lbs and the large is a perfect slim fit. The see-through issue is all I can gripe about. So, I'll wear it under sweaters and be happy.