Can anyone tell me how the heavier weight Flicks fly? Are they really overstable or not?

they can be turned over but if not they will hyzer like a pig :D

They are a little more overstable than a Z-Talon. Not much though. I thought they would be like a Monster but they are not even close. Great for long hyzers.

have you guys thrown them forehand? how do they handle more rotation and high speed? do they flip wicked easy like a flash?

No, it is nothing like a Flash.

I have one. The rim is really wierd. Extremely wide and shallow. It doesn't feel that great in your hand. I have never seen a shallower, or wider rim on a disc before. It didn't really find a place in my bag. I am fine with my monster, Z Talon, and Tsunami for overstable drivers.

The one I carry is faster and more overstable than any of my Monsters. I love Monsters but my Flick is my distance forehand disc. The 172-173's seem to be the most overstable.

yeah they're pretty overstable. they're as fast as the 150's. i like em for forehand - they wont turn over unless you really make em. most of time you need to worry about keeping them flat so they dont hyzer out too early. their speed adds D to your forehand. give em good spin and they're a nice accurate forehand disc. i carry a 150, a 170, and a z-talon. flick is longer than the talon. hope this helps.

Yeah, I'm surprized they're not more overstable considering the rim width.
I've been throwing a 172g and a 150g for a few months now.
Their hyzer glide is long and consistent.
Although I cannot get them to turn over and keep the burn, I can get some fab "S" curve helixes when I get a good snap and don't overpower the throw.