What is your tolerance for risk?
If your looking to go long (and I mean a couple of years) it may be a good speculative play.
Most sites I do my research on seem to have a few buy recommendations and mostly a hold. The good thing is there are not a lot of sells. I've seen target prices in the mid 3's but they really are just opinions.
Don't read too much into the subscriber numbers but rather how much it cost this company to operate.
T-Mobile USA still manages (although it could change) to make money with less customers on about the same sized footprint.
This Network Vision initiative may be just what the doctor ordered and should reduce operating costs but at a heavy initial price.
It seems like all the negatives are already factored into the stock so a lot of it depends on your faith in the current managements ability to eventually turn a profit.