I really like Terramaxx. It's simple and improves the scenery. I know Xplane has its limits but there's always room for improvement :
100% compatibility with the TBM900. Really, somebody has to do it.
The bump mapping is nice, especially at dusk. But I would like it to be more subtle and better integrated with the tile.
Eg. Depressed roads and heightened hedges.
Little less reddish in the fall (European falls are gray and muddy).
A bit milder winter, more gray and brownish tints. The current mild winter is a very deep winter and the deep winter is the next ice age.
Limit the repetition at high flight levels, without sacrificing the detail at low levels. Maybe by making use of the bump mapping at bit more.
An option to have high density forests. I have allpilots hd forest patch installs and I think Terramaxx is overriding it. The hd forests also suppress the repetition in
areas such as Germany and Scandinavia.
Urbanmaxx TM is a hidden gem for IFR. Does it have bumpmapping? If not, it could really benefit from it.