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No experience with the Transcend line but we have a Reflection and have been very happy. Only one issue with the refrigerator. Control boards were replaced under warranty to solve it. Grand Design does a good job and has good customer support from what I have read from folks that needed issues resolved. With any brand/model you're looking at, make sure and go over it with a super fine tooth comb at your PDI (pre-delivery inspection) before you leave the dealer with it and get any issues resolved right up front. Google "PDI checklist" and put together a list of everything to inspect.
A few months back we were looking at the Transcend 321BH and were very impressed with the build quality. We have a 2020 Jayco that we really like but were wanting to step up in size just a little. In my opinion, Jayco and Grand Design have a little better build quality than some of the other modestly priced mainstream units. We ended up doing some mods to our current travel trailer that makes it more accommodating for us. We looked at a lot of the other brand names and they just did not seem to stack up in various ways. Everyone knows that most travel trailers are not well made as an industry so you need to find the best available.