So, I've done a couple of rides with this jersey and so far so good. It was a little cool for just the jersey...first ride was about 47 and the second was down to about 40. By itself this jersey would really shine between about 50 and 60. It lets quite a bit of air in, so if it's windy, forget about it. From 40 to 50 I would recommend a base layer underneath.
For sizing reference I'm 6'0" and about 210lbs. I went with an XL, I probably could have gone with a L and been alright, but I wanted room to layer underneath. I think the XL is a little long in the sleeves though.
The Ginger (Red) is a really nice red. It's bright enough for motorists to see you, but it's not an obnoxious neon yellow.
Overall I like this jersey. I am biased, however, since this is my first long sleeve jersey.