What is the general consensus on gloves like these?

http://www.teamestrogen.com/prodLG_1482096.html

I saw a pair at a LBS yesterday when I picked up arm warmers and smartwool glove liners. They appear to be quite versatile, but how easy is it to use trigger shifters/brakes with the finger covers over the fingers?

A local bike store had a 30% sale this weekend on gear, since they had no Smartwool arm warmers in stock I picked these up for a really good price, as well as the glove liners mention above (for 10% off).

I found such a large difference in sizes for the arm warmers. For the PI warmers I took a small, but tried on several pairs of Gore Windstopper arm warmers and even the medium was much too small... I am very glad that I was able to try them on before my purchase.