Scotty Bwrote a review of Giro Selector Helmet on May 5, 2016
Familiarity: I've put it through the wringer
A good TT helmet is aero, has venting and is the best shape for YOUR TT position. Everybody has a different position on the TT bike and there is not a "one size fits all" or "best TT helmet". Rather, the best helmet keeps you aero during the entire race.
This means that if you are constantly looking down at your computer during the race, a helmet with a tail is going to turn into a tall brake every time you look down. This helmet has a medium length tail which means you need to be able to stay in your tucked position during the entire event, otherwise look at a stubby tail helmet like the Bambino by Kask.
The only negative about this helmet is its lack of venting. It gets warm during a race but a lack of venting is faster. I know the description mentions that the lens "ducts a sizeable volume of cooling air to flow over the head and out the twin exhaust ports in the tail of the helmet." it really is hard to tell. I have used it in a 75 degree race (10 miles) just last night and I sweated a bit so this summer I may cook a bit!
Overall, Yes I would recommend. Yes, I would buy again. And Yes, it performs well.