I've built the motorized version, AD. It was REMOTE controlled, that is, a box with wires running into the bottom of the hull. The torsion bar suspension does indeed work, and the tracks are single-link, but heavy for the scale and not very accurate.
Tamiya re-released the Panther A kit a coupla years back, with a nice RADIO control package, but not the Jagdpanther.
Both the Panther and the Jagdpanther show their age, and there are lots of accuracy problems, but they are fun and easy kits to put together.
Here are pix of my Tamiya 1/25 Jagdpanther and Panther A:
Obviously the Jagdpanther hasn't been weathered yet at all (don't you love that shine?), but it gives you an idea of what the kit looks like.
I paid 10,000 yen ($84 US) for this kit here in Japan, but these were older, collectible kits.
But I built 'em!