Outstanding product! Just make sure you get one to two sizes up from your regular shirt size for two reasons:

1) The neckline tends to restrict normal breathing if it’s too tight specially when you’re doing long runs and your body is already tired and worn out.

2) You want to get a longer than normal arm sleeves because the fabric is very slippery and tends to ride up all the time. This tends to be very annoying/irritating, especially when you're running a lot.

I have both the short- and long-sleeve versions of the Pro top. I suffer from a bit of RSI in my right shoulder from spending all my working hours on the computer. The Pro Top really helps support the shoulder. Very fitted, it has a tendency to ride up when worn over a pair of tights, conversely being very slippery fabric when worn tucked into a pair of tights, the latter have a tendency to ride down. I go for the latter option and wear a slightly less fitted shirt over to top.

I bought this top to go with 3/4 length tights for long distance biking and running – I’m a masters age athlete. I am happier with the top than the tights, but still not overwhelmed. The top is short and does not really work as a biking top except under a jersey as a baselayer. For the summer season, I can't really imagine wearing both. While I am not sure about the stamina claims, it does seem to help me recover somewhat. It also feels great next to your skin. Unlike the tights, there are not a lot of alternatives if you are looking for such a product - if price does not bother you, could be worth having.