I have had three Forest River products and now a GD. Quality is about the same as most RV frames, furniture, appliances all come from the same companies. Since they all use Lippert frames you can find nearly identical floor plans with multiple companies. As far as workmanship of the workers themselves go - they also seem to be about the same. I have found some poor workmanship on all of my RV's.
With most FR products you can buy an extra year warranty for around 100 bucks. GD doesn't offer this; however GD has been known to repair parts for free out of warranty. They will also ship the part directly to the customer and let you install them. They also have just started selling parts directly.
So my play on GD is it's an average RV at an above average price but for that higher price you are getting very good customer service.
Will I buy another? It depends upon how much more it costs me than a comparable FR or other brand's product. If the GD is lets say $5000 higher than an equivalent FR then the chance of me getting that back in a replacement parts out of warranty is not very likey. Now for 1-2k I would more than likely by another GD.
Good luck with your decision.
2020 Ford 350 6.7 PSD & 2017 F150 3.5 EB max tow
GD Reflection 29rs
