Mind if I ask what your warranty issue is? Sorry to hear!
No not at all, and don't let it discourage you from getting the 350M, it is a great unit. I just had a few punch list items on the unit that needed addressing.
* When we were going through the PDI, the panel under the Happi-Jac bed was damaged from the way the pins rode in the table. Not a big deal and its just a simple replace.
* My garage floor had a lot of squeaking when walking on it. Come to find out it just wasn't fully secured down. They are putting a few shims in it and it is suppose to take care of the squeak.
* My two awnings didn't match. This was because my unit got the last of the old design and also a new design. GD sent a new one to replace the older model on there own.
* My Gas sensor has went off on two different occasions while the unit was stored up. Both times the LP tanks were on and the gas sensor did pick up gas. Now the dealership said there wasn't any leaks they could detect, but I said I smelled the gas from the outside of the coach and not the inside. They will be checking on that some more.
* I am also having them rewire the light switches in the main bedroom to were the two night stand lights work on independent switches instead of the ones over the bed. This way the DW can read a book while I try to sleep without having the light shinning in my face.
The only real issue I have had besides the gas smell is that my ramp door is slightly cocked and I can see daylight out of one side of the door. I am waiting to see if warranty will fix this issue or not. Also the Furrion radio (cheap head unit) has went out, but JD with Grand Design sent me a new one that I swapped out. If it is something that I can tackle myself, I just get GD to send me the replacement part and I fixed the issue.