I'm a BlackBerry refugee. BB10 is dying a slow and painful death (in retrospect it was DOA) and I have tried numerous times force myself to like Android, but I just can't do it.
I am very cost-conscious when it comes to the tech I use. I refuse to get locked into a contract or go into debt over a phone, so I prefer to buy mine off-contract and use a MVNO (Ting).
If money were no object for me, I'd probably get an iPhone or a Lumia 950 XL. But money IS a concern for me and there are many, many things I'd rather spend money on than a phone.
Low and mid-range Windows phones hit a sweet spot as far as bang-for-the-buck. I used a Lumia 521 as my daily driver a couple years back and was thoroughly impressed at what I got for my money.
If the renders are true, I think the Lumia 650 looks fantastic. It'll be the best-looking Windows 10 phone so far. The specs don't concern me nearly as much as real-world performance. Windows phones are known for getting a lot out of low-end hardware, so I'm not really concerned.
If it is around $200 off-contract and they sell an unlocked GSM model, I'll very seriously consider getting one.
So I'm definitely leaning "yes" on this one.