It's ok I guess. I just sold mine, and wouldn't buy another one again. When it worked, it worked. But I had it replaced 3 times in 2 years.
I will say though, their warrenty service is the best I've ever experienced. I didn't even have to mail it away, all three times Vortex arranged for me to just take it back to the dealer I got it from, and they handed me a new one.
But again, I did have to replace it 3 times....