|Delicious new rules!|
As a Mechanicus player I find these rules (and the model itself) a little underwhelming. It seems odd to me that the Skorpius doesn't have an invulnerable save, because every other Adeptus Mechanicus model does.
Moreover, the loadout and weapons of the Disintegrator are a bit mediocre. This thing has to line up against the mighty Onager Dunecrawler and it loses out in just about every aspect. The Dunecrawler has an excellent 5+ invulnerable save which is so valuable in 8th edition; it can also carry a neutron laser which is surely a better anti-tank weapon than either the Belleros or Ferrumite cannon of the Disintegrator. Honestly, I'm just a bit unsure how this tank is supposed to fit in with the existing army.
The transport variant is pretty basic. It's cheap in points and isn't particularly durable. The weapon loadout of four heavy stubbers isn't going to scare too many opponents either. However, I reserve judgement on the Dunerider until I see it on the table. Adding a transport into a Mechanicus list does open up a lot of options that weren't available previously (except for the Termite).
Anyway, those are just my quick thoughts on the new rules. Feel free to comment below and let me know if you agree!