Re: Couldn't believe this glove!!
Speaking only for myself here...
Fingerless gloves, while better than nothing at all, don't really offer much protection. In a fall, your palm and fingertips are the most susceptible to damage. The problem is, your palm is better protected than your fingertips because it is generally thicker and "meatier". It's rather easy to grind your fingertips to the bone on even a low speed slide.
To tell the truth, I find that deerskin perforated gloves are even more comfortable than fingerless gloves. They allow a pretty decent airflow even at lower speeds and your fingers will not get sun or wind burn. Another glove I find to be pretty well made and comfortable is the Joe Rocket Phoenix Glove.