I agree the recent T-series Talkabouts are built WAY better than their predecessors and the competition. The older Talkabouts previously were made for Motorola in China by Giant International. Motorola ended their deal with Giant International a few years ago and the latest T-series Talkabouts supposedly are genuine Motorola made. The build quality of the latest T-series is definitely better. I own a few T800 Talkabouts and absolutely love the blue LED display which shines through the case plastic instead of through a window for the display.
I have used the DTRs while indoors and outdoors and while mobile. I have never noticed any effects of foliage. If foliage affects coverage at all, the effects are way down in the noise compared to everything else that will affect coverage first and not worth worrying about. Where the DTRs do really well is inside buildings because buildings are more “open” at 900MHz compared to 462MHz or 154MHz for that matter and the reflections actually can help. The FHSS operation also helps because the frequency hopping also causes individual hot spots and dead spots to hop around, effectively stirring the modes so to speak. Where the DTRs blow everything else away is when aboard cruise ships. People who have used them on cruise ships report having 100% ship coverage on all decks compared to a pair of 4W UHF Part 90 portables on GMRS which had trouble penetrating more than about 2 decks. The DTRs work amazingly well and people keep underestimating them.
My favorite FRS bubble packs have all been made by Motorola. Even though I use the DTRs on 900MHz and my wife now prefers them over any analog radio, I found it worthwhile to keep a few Talkabouts around for occasional light use of FRS when needed.