we have had our 840 for about a year now. We purchased it through Byerly also, we absolutely love that shop and the people that work there. I know there are many other good Commander shops out there also(many online here can share with you their experience also), but they are pretty close to where we operate and I have a great relationship with Bruce/Scott/Tim/Ryan/Wayne, etc... If fact if you just visited them recently, you probably seen our 840 (5955K) in their shop for the 150 hour inspection. Picking it up in the next few days if the weather moves out.
We absolutely love our 840. As far as the numbers, i would agree with all of them posted above here. Every 5 years you have a gear inspection and if they replace many "worn out of tolerance parts", this specific inspection can run about 15K or a bit more or so i am estimating. Really depends on what parts are out of tolerance for specific pricing on this though. Also, the props have 4000 hours and/or 5 year time line inspection also, and that can run a bit more also. But all planes in this class have these type of items and many alot more. But i agree on everyone here in the post of the numbers they have presented.
Going into our specific purchase a year ago, i was saying to Scott, "Buying a 1000 or I am going home, with our 680FLP", lol!
But what sold me on our 840 was Scott saying "You are paying for 50% cost of a 1000 for 85% the performance"! Very logical and i couldn't really argue with him. They had a 840 that needed some paint and avionics but was overall a very nice machine, so we pulled the trigger. This machine will fly forever, at 28K it will easily do 1800 nautical, maybe more even! For us, out of central Wisconsin, we make Sarasota, FL direct and land with about half tanks, lol. You got to love 474 gallons!
We just love all the Commanders and have owned a few different models over the years.
I told Bruce that if he finds a RVSM 1000, with only 300 hours total time airframe, and low time engines, to give me a call!
Good luck with your search and welcome to the Forum!