I just forked out $140 US to put a 250GB Evo 840 in my pc and it floats!
Can't wait for a 1TB option at an affordable price so I can pop that baby in there too and finally get rid of my HDDs for SSDs once and for all.
Really, dear god HDD->SSD is like the single best upgrade possible, anything that brings down prices I'm all good with.
Considering that the M550 didn't perform really well at 128GB - which is a good budget capacity - I really don't expect these budget drives to perform well at all. They didn't do too well in performance consistency, and they weren't the fastest either. Going down to 16nm from 20nm MLC will also reduce durability/endurance.
So I suppose the proper use case for this drive will be for getting a SSD at the lowest price point and ignore all the other factors.