I have the MP Designs S-55. It is a sheer joy to fly. The flight model is exemplary. Much like the Gazelle it is pretty revolutionary in that respect. I cannot recommend it enough. The VC is also nicely detailed (it blows the old Alphasim model out of the water!).
The niggle is with the use of materials, or rather the lack of them. There is no specular and no bump mapping. They don't seem too clued up on the use of Alphas either. To many seasoned simmers this harks back to FS9 days. Reluctantly I have to agree.
Through the wonders of social media (!) I've established a line of communication with MP Designs. When it comes to real life helicopters they sure know what they're talking about... more than 99.9% of simmers I'd guess... members of their team are Gazelle and Mi-8 pilots. In the case of the former it would be kinda like SkippyBing designing a Lynx HAS!

However, unlike most their mesh designer doesn't work in Max or GMAX (or even Blender I don't think), but in something entirely different. This then has to be ported into an FS model. I get the impression the designer is not a simmer either. Somehow the need for other materials hasn't been communicated to him... until now! Chatting to them I made the need clear and within a couple of hours I was getting experimental renders of an S-55 with spec and bumps! Even their first attempt looked great.
Trouble is I don't think they are currently putting their efforts into making an SP for the S-55 or Gazelle, or even making headway on the Whirlwind... Their sales have been sooooo slow they have formed the impression it is due to their choice of subject rather than the product itself and have convinced themselves a GA helicopter must be a priority... Hence they are pulling out the stops to produce a Cabri G2.
I think if the community got behind them and encouraged them good helicopters would be the result...
Formerly "Airtrooper"
i9-10900KF, 64Gb RAM,
RTX 3090, Quest Pro, Win10 Pro 64-bit
Saitek Combat Rudder Pedals, Saitek X52 Pro