Just brought my 2017 GD 303 home 3 weeks ago this past Saturday. Haven't taken our maiden voyage yet (crappy weather big time) but it seems very good overall. I have a full barn with power and water and it stayed plugged in and water on for the first week. No problems yet. I did find a few very minor issues that I've dealt with myself.
The coroplast wasn't sealed well at all. Matter of fact, one rear stabilizer on the ground control 3.0 was sealed around the frame, opposite side was not. Also quite a few places that needed sealing around it that I just did with a tube of black DAP caulking.
Lousy low point drains. Added quarter turn ball valves them instead of the cheesy plugs.
There is no aluminum or sheet metal in the wheel wells to help protect the underside from a blow out. Even my old cheap Crossroads Cruiser before this one had that. I'm looking to hopefully add something to that. Luckily I'm extremely OCD regarding tires and pressure. But blow outs still occur.
Then I have a pretty good wrinkle on the roof in the rubber roofing right at the front cap. I have already contacted GD and was advised that it would be taken care of no questions asked.
Overall we are very happy and looked for well over 2 years. And we always came back to GD and the customer service was a big reason why.