In short, this is a reasonable functional base layer.
Firstly, I have a few issues with the Amazon listing. On the initial purchase page the item description was "Under Armour EVO Coldgear Compression Crew II" which is fine. However, once I went to my basket it was listed as "Under Armour ColdGear Crew II Mock First Layer Compression Top Long Sleeved for Men To Protect Against Cold". Aside from being a long winded description it made me concerned that it would be a mock neck rather than a crew neck. In case anyone has similar concerns then it is a crew.
Secondly, it is not a compression top in the sense that I use it, but is very fitted and tight.
Finally, the review. I like Under Armour and already have a Coldgear Compression Crew and a Mock. As they have stopped making the regular Compression Crew I decided to try the EVO. It isn't as good. They still make the mock so (unless like me you find mock necks a bit smothering) you'd be better off with the Coldgear Compression Mock. Otherwise it's a satisfactory base layer.