I have the HP Envy 360 with the Ryzen 5 and I think it is really a game changer for AMD. It is a fast chip, doesn't heat up like old AMD chips(Turion 64) and has good battery life.
I read a lot of reviews about the HP and was unsure if I was going to be happy due to so many poor reviews and benchmarks but I found out that all my worries were for nothing. The HP is a really nice machine. It is unfortunate that they ship the big box store model with a spinning hard drive instead of an SSD. I think a lot of the poor reviews have to do with the HDD.
I think this is one of the best options available until the AMD Ryzen 7 2700u machines come out. As for the size it is perfect. I like 15" and 14" as I find 13" too small and 17" way too big. It is also very slim comparable to a Macbook Pro 15" latest gen.
The thing I like about this PC is it has quality components for a decent cost. I opted for the SSD and 16gb ram. The slim bezel FHD glass screen is very nice, speakers get loud and have decent bass for a laptop. The overall build quality is very good and is all aluminum chasis.
As for performance my daughter has an Acer Aspire with the 8th gen core i5 8250 with 8 gb ddr4 and my AMD seems faster for most tasks but there are some times where the Intel seems faster but it is really hard to tell any difference in person. The Acer has a dedicated MX150 Nvidia graphics card and I haven't yet had a chance to compare gaming performance.
Considering these are just coming out and I ordered direct from HP I still feel the cost was reasonable. In fact, I had a Macbook Pro late 2016 which I sold to buy the HP and I had a lot of extra cash-several hundred dollars and for me I feel no loss in performance or quality. I actually like the HP more as the touchbar is not as usefull as the touch screen. I do like Mac OS but it complicates things for me with my Android phone and use of MS office. In the end the Apple was nice but more expensive in every way with zero added benefit-in fact it was a loss when you factor in adapters, apple care, etc.
Also with all the Intel security issues lately I am happy to be on an AMD platform. I know there is no completely secure computer but some of the latest Intel blunders are pretty bad. Having an AMD machine does not make you immune but with a good security solution like ESET you are better off than most.
Lastly a lot of reviews and benchmarks are a little biased at this point. Real world use of the Ryzen 5 seems better than the benchmarks suggest. This is just the start for AMD. Hopefully they can keep up the pressure and do a better job of driver support. I like having a choice and finally I don't have to suffer by trying something other than Intel!