I think R5 is great value. Right in the sweet spot. Although I do not own one (for now). I am sitting on the fence in regards of stretching my current system (email@example.comGHz) for another year or doing R7-1700 system to serve me for another 5 years with GPU upgrade every year or two. That said probably even R5 would serve me well.
I have a significant average background load (continuous backups running with large
dataset) so Ryzen seems to me a very
interesting option. Its single threaded performance is about the same as I have currently (4 GHz Ryzen ~ 4.3 GHz i7-3820) but it still would be kind of side-grade and I cant live with less than 32 GB of RAM but DDR4-3200+ is damn pricy atm ... and so I am sitting and looking at things.
But the point of the day is that I am
looking even though I'm on LGA2011 platfrom already rocking 4c/8t part with mild OC so I would say Ryzen is certainly quite a solid showing from AMD. Compared to, for example, Bulldozer where I was as hyped as anyone else and as dissapointed as most others when it was such a flop. For reference I should add that what I do is floating point heavy so for me Bulldozer and its follow ups were particularly floppy as they had only half of the floating points units.
That is how my normal load looks like, nothing particularly intensive, just a browser open with 75 tabs, few backups running, Matlab analyzing slowly some dataset in the background (I/O bound so relatively little CPU load), remote desktop open to a VM in the server...
What many people seem to be missing when dismissing Ryzen is how much of "background activity" there can be going on when the PC is in essence "idle". Throw in there a cloud backup service doing its thing, e-mail and web browser open with few tabs and you can easily hit 40% average background load with 4 cores / 8 threads.