I have had good luck with my 221RBXL. The only issue I had was that the corner shower basin leaked pretty good. I used clear, bathroom silicone around the top of the shower basin and where it meets the wall. I also brought the silicone in from the wall to the basin where the shower curtain is on both sides so that if any water was running along the top of the basin towards the curtain it would fall into the basin and not the floor. For the life of me I hate when manufacturer's cut corners like this. For now on I will add spraying the shower walls and looking for leaks during the PDI. I would have the dealer remove the service plate first though so you can look under there with a flashlight while they spray.
Also, mine had a wobbly dinette table with the two support poles. Complete junk. There are a few threads on how people have modded this. I basically changed mine to hinge from the wall with one folding leg at the other end. Solid! This type of dinette is used in many manufacturer's models and not just a Salem issue, but a wobbly table is a pain.
On that note, be sure to download the PDI sample from the Library link above. You'll see it at the Most Popular Files box towards the left. Take time with your PDI and don't worry about how long it takes. The dealer slots plenty of time for it but a lot of people go through the process too fast. Consider taking small movie clips using your smart phone so you always have a reference of certain PDI topics (water heater settings for winterization, etc.).
I have had a lot of fun with my Salem camping or doing mods. Been a blast!