I have one, and love it. One of my range buddies has a CED M2 (allegedly, the most accurate one and an IROA favorite). We put them in line and they measured spot on. We did this at 6 PM and started running out of day light, but my Pro Chrono was still able to measure when the CED was unable.
If you're thinking in getting one, go ahead. You won't regret it.