I have a 2012 model Host Everest. I bought it from the factory and watched them build it.
They have changed the floor plan a little since I bought mine.
Customer service is very good, since I go to Bend a lot, I just stop bye if I need a part or have a problem which is rare.
If I were to buy a new unit, it would be the Mammoth.
The Everest has an East-West bed, this gives you a huge nearly 8'X 3' closet in the front overhead. This is wasted space for me. The Mammoth has a North-
South bed which utilizes the space much better.
I would delete the electric fireplace and have have drawers or shelves installed instead.
Regardless of the model, I would get rid of the U-shaped dinette and have two recliners installed. The table would be an oval coffee table type that raises and lowers as needed.
I might also swap out the rear slide couch for recliners.
I have stayed nearly 300 nights in my camper and have never used the toilet. I might delete the toilet and black tank and maybe have them install a larger grey tank. This would give me more bathroom space and I could always get a portable toilet if I ever have the need for one.
Most of my problems have been self inflicted. I tore off the basement door when I left it open when removing the camper and it if got caught on my 42" extension. Host installed a new door and only charged me for the door.
My camper was the first one that used their new drawer latches. They were a complete failure. They could not hold the drawers closed with weight in them. I didn't get 50 miles from the factory when the drawers flew open on a corner and tore out the cabinets with them. They fixed that the same day.
Host installed the fire alarm right over the stove, bad idea, I fixed that.
When you put in the rear slide, there is only about a 1/4" clearance between the slide and the awning switch, porch light switch and electrical panel. The slides will sometimes wiggle a little when you move them. The rear slide took out the switches. Host moved them out of the way and the new models reflect this.
Over a year out of warranty, the main slide switch burned up. It is a rather heavy switch with a lot of copper. A lot of juice flows through this when operating the slides. Host sent me a new one free of charge and it only took a few minutes to install.
I just got back from Bend and stopped in to ask what type of chalking to use, as I thought it might be prudent to re-chalk after 4-5 years. Host gave me several tubes each of the 3 types they use and showed me where to apply it.
Any questions, feel free to ask.