It seems you're interested in a MB GLC 300 4Matic w/that huge glass roof. Well, we're a used dealership, and in our region we process about 7-9 vehicles/quarter. Some are the initial release 2016's, but we see most model years through 2020.

I like them. Partly because they're a slam-dunk sale, and partly because it's a rather nice, comfortable, classy ride.

Drivetrain is from the C-class sedan models (which date way back), and we find them to be quite reliable up to and beyond 160,000 miles of usage when given normal, period maintenance performed by qualified personnel.

The 2.0L I4 w/turbo mated with a good 9-speed transmission produces a nominal horsepower rating (about 240), but be prepared for the very quick 0-60 acceleration times (our mechanics and lot people find excuses to "test" drive them).

However, I must speak to the use of "globally sourced" engines, transmissions, and other major components that first appeared in model year 2018 GLC 300 vehicles. In our limited experience, such major and minor components are of significantly lesser quality of manufacture than anything ever produced in Bremen or anywhere else.

Periodic maintenance and service is rather straightforward, mechanic access to almost every drivetrain and chassis system and components is surprisingly rather good, which makes it entirely possible for owners to do lower-level service and maintenance.

Major servicing/repairs, and even troubleshooting is altogether a different story, and can be very, very costly. Even the cost of the analysis equipment is exorbitant ! OEM replacement parts can be costly, but not necessarily the nightmare that some may speak of.

We do all we can to assure any vehicle we process is clear of any and all recalls and/or safety issues before any vehicle can even make the sale lot. That being said, clearing recalls of MB products, including the GLC 300 vehicles, can be time consuming and difficult, but hardly any worse than GM or Ford products, and far easier than several other makers products.

We encounter minor issues with interior trim, panels loose, seat operation, and other issues that could easily be encountered in virtually any other vehicle, and we simply correct them, but sometimes others may comment on such issues as major defects reflecting horrendous quality. They are most definitely not.

You mentioned the optional glass roof: Very rare, hard to find. But it allows passenger views of the sky that would never otherwise be viewable. My wife loves hers.

I've tried to be honest and candid. Please advise if I've mentioned anything erroneously.

Check the Lexus RX350. 

I understand you want to ditch the car after coupe or years, but if you are lucky and the MB works for you well, the money you loose during these years are a lot. 

I'm sorry to say that but you are completely wrong regarding the depreciation and cost repairs. For depreciation, go to websites like CL and find out about appreciate in real world not fancy world that some websites live in. 

About the parts and labors, parts are much more expensive for MBs than Lexus, and this is just one part of the issue. You think you can work on your MB, maybe you can but you need awful lots of tools that I don't think you have. We are here to help out based on the experiences we have.

At the end, it is your money and you can do whatever you want. Good luck man.