I installed one over my bedroom (optional/pre-wired) last June.
Its non-ducted with the ceiling housing.
Not hard to install and is low profile.
Definitely noisier than the new Dometic Brisk Air 2 I also installed to replace the failed main rear ducted AC last summer too. We never run the bedroom AC at night due to the noise.
Of course any AC only feet away is going to be noisy.
Since my RV is not as high as some of the newest/biggest are, I think I would have installed another Brisk Air 2 versus the Coleman Mach up front as I see lots of Fivers with full height front ACs.
Retired USAF
Silver 05 Dodge RAM LB CTD Dually 4Speed Auto SWD 3.73, Westin Sportsman Grill & Taillight Guards,Husky Mudguards, Retractable Ball Hitch, Onboard Air & Horns, MaxBrake - towing 2005 Keystone Montana Big Sky 3670 with Star Performance adapter