The M1 from Prodigy is their most overstable midrange in their lineup. The M1 has a nice flight, straight and then heavy fade at the end. It really holds up to the wind well and it is a fast disc that still has some glide. It reminds me a little of the newer Sentinels in flight. Really nice midrange, but the feeling in hand is different. It took some getting used to.

Here is our review of the M!

The 400g M1 (the retooled version) was not as overstable as everyone was hoping it would be. They announced a more overstable M1, but the re-tooled M1 seems to be exactly the same as the old M1. Regardless, this is a nice overstable midrange disc. It has an okay amount of glide, so when thrown hard can get a good amount of distance. It is dependable in the wind, and the fade is reliable. 

This is no Justice or Gator, but it is definitely overstable. I would compare this to a Hyzerbomb Mortar or a Discraft Drone, with just a little bit of straight to the flight path before hooking up and getting stable.

Overall I would say if you're looking for something overstable, but not quite as beefy as a Gator or Justice, try out the M1.