I have used a Spyder MR1 which i thought was much better.
I use a Spyder VS2 with a Veiwloader
I wasn't too impressed with this marker in my opinion. I got it and used and the first round gas started leaking out of the gauge. And I no for a fact i didn't drop it or damage it before also. Also you can use eyes on 3-Burst which is a bummer.