The flash is very similar to a Gstar destroyer or a trespass but won't get as much distance.  Its good for beginners who want to get into deep rim distance drivers.  The rim is similar to a thunderbird where it is fairly deep but not crazy.  The most noticeable flight number is the fade.  It will dump hard left at the end of the flight after turning over a little.

I love this disc. When I lost my Z flash, I bought 2 ESP ones.  The ESP ones are bit lighter than my Z was, so keep that in mind when I say the Z seems a bit more overstable than the ESP plastic.  Z vs ESP in general, I'd say the Z is more durable and more slippery when wet.  ESP is a good compromise for durable and grip in wet conditions, but feels a bit stiffer.  Both plastics last a long time.  The ESP seems to turn a bit more than Z plastic, too- back to that stability comparison.

I throw these discs on most long holes, unless I really need more distance, turn, or if there's a big change in altitude. I find these more forgiving (naturally) than the highest speed discs out there. They fly rather straight, and I can put them on long anhyzers and know they'll come back and fade at the end without crashing on me- unless there's operator error. 

One thing I've noticed- these discs, though rated less in the distance category, often out fly my longest drivers because they fly straight, and they don't require the same precision and power to go that the highest speed discs require.  

In summary, I say the flash can go straight in a tight tunnel for a long way with a predictable fade at the end of flight.  You can cut a long anny with them and they'll stay up thanks to that stability/overstability. If you really crank it flat it will turn a bit, hold and come back.  You can work a nice S curve with a touch of anny and lots of power. I've aced more holes with my flash than any other disc.

I've been throwing these for years, and am find myself frustrated and unhappy without a flash in my bag.