I bought a pair of shirts and one of their highly touted undershirts about 2 months ago.

Personally, I think the shirts are a bit on the thin side not and as wrinkle resistant in comparison to the A Cut Above Tropo shirts. However, the collar is a better design and holds its crease which is the largest complaint I had about the Tropo shirt. Additionally, I have not noticed and pilling yet which is another issue I've ran into with the Tropo. It's a nice fitting shirt and seems to be high quality. I will note I had to order a .5 size shorter on the collar to fit in comparison to my A Cut Above shirts.

Personally, It's going to come down to personal preference... But I really like the JetSeam shirt.

Now the undershirt on the other hand, is not particularly something I would recommend. It is very nice to the touch and definitely is a high quality undershirt - think underarmor material. However, you can get the same thing from Hanes (underarmor type material) for about 1/4 of the price from walmart - albeit at a lower quality... It's an undershirt though.

Haven't tried the Jetseam pants, but I'm in love with my A Cut Above pants. Don't think I will be trading those out anytime soon.