I agree with others, the price increase overall is negligible and while 50Mb/s download might be sufficient, the extra upload bandwidth alone would be worth the cost. 5Mb/s is abysmal, and while 10Mb/s isn't amazing, doubling your upload speed will insure multiple users will have an easier time sharing resources.
I have 1gbps service, over ethernet I get 850-940mbps download and upload, depending on the servers I test to and the time of day. Over 5Ghz wifi I get 350-450mbps download and 400-500mbps upload.
For the Wifi I had to enable 80Mhz DFS channels in order to get these speeds, without that custom configuration it was automatically using 20Mhz channels and I would cap out around 200-250mbps.