The Academy M10 and M36 are basically nice models, but they have several problems which stop them being great. Probably the most annoying is that the turret on the later M10 (and the 17pdr version) is too narrow. Not sure if that applies to the early version, as I don't have one yet. There are also issues with the hull angles, though that's less noticeable. The interior is packed with bits, but the firewall is too far to the rear, making the engine too small
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The placing of the hull floor escape hatch is off too, the inside doesn't match the outside location.
You'll also find the tracks are narrower than either Italeri or Tamiya, so build the sprocket around the track if you are going to swap, otherwise it doesn't fit.
But when you build them, they do look like M10s, the suspension is really nice and the 76mm versions have a load of fibre ammunition tubes for the internal racks. You get the same tubes for the 17pdr version, even though it stowed the rounds uncovered.
Looks to me like the track on Crockett's model comes from the original Tamiya M4A3 (if its vinyl, of course). And there isn't a recoil guard on the original M10.