In my opinion, that's not the best deal in the world for $600.00 bucks. Once yout get in the $600.00 dollar range you have 2-3 different types of Impulse's to choose from... My advice to you is to research online and choose wisely. For example I got my "Game Face, Thuder Impluse" for $625.00 the other day. Once you get into this range the 2 or 3 custom versions of the Impulse they start offering some of the upgrades, like the trigger, tapeworm, Titainum pin, delrin bolt, custome milling, and the Vertical MAX-FLOW. Which I notice your's doesn't list. Mine came with all that which is hassle free in my opinion. And then of course it's vision ready / W.A.S. ready..
I think you should keep looking, I suggest you check out the RAT JR STAGE 2 setup. It's around the same price for $575.00 And it looks cool, slightly different from the "Standard" Smart Parts style impluse, if your also into the looks of the marker.
If you can't afford to be in the $575.00 - $625.00 range then you could always back down and take a look at the same website (that I can't list here) they also offer a slightly hopped up "standard" SP impulse (trigger, grip etc...) If you search the web you'll find the site I'm talking about.
good luck.
