Yeah, I've been throwing Pure's for over a year and a half now and have nothing but great things to say about them.
I originally switched over after putting with Magic's for the longest time. My main complaint with Gateway is their lack of consistency in the plastic, making it a total guessing game when ordering online. Sometimes that disc labeled as SSS comes to you feeling like a firm instead. Bleh :/
Anyways, pick one up and see if it feels good in your hands. The disc itself has a fairly shallow rim compared to something like a Wizard, and has a pronounced beveled edge making it pretty unique. I think it's the best feeling putter on the market, and the Lat64 zero line plastic is hands down my favorite plastic for circle putting. Be advised that the zero line gets banged up pretty quickly if you are using it off the tee.
As far as flight, they are pretty neutral to slightly understable with a good amount of glide. It's not going to handle a strong headwind without turning over, but in calm conditions it's stable enough to not have to worry about overpowering it. I've heard the Opto version referred to as a mini-Buzzz, and I couldn't agree more. Put it on it's line and watch it go towards the target.
Give it a shot if interested, I love it but YMMV. I use the grippy zero-soft line for putting, and the Opto exclusively for all tee and upshots.