I think they are a great concept. I like the long wheelbase ratio, the IFS, and the tapered front end. The nose profile is the most efficient from an aero standpoint, of all RVs. Thor worked with Ford to test the profile, and the reduced drag is what lets them offer taller gear ratios, while still having a high frontal area limit (to comply with MDT greenhouse gas limits for class 3 vehicles).
But... Thor's quality control program is hit and miss, and if you ever have a problem, you are at the mercy of the warranty approval process, meaning you could be months without your rig while waiting on repairs.
I would suggest holding out for one with the new 7.3L, as the E-series V10 doesn't make the same power as the F53 V10. But the new 7.3L engine makes more power, and is the same across platforms.