Historically, even when under Commonwealth/Epix my DSL download speed has been 1.3 to 1.5 Mb. Of recent, download speeds have been almost consistently 1.5 Mb. Upload speed runs fairly consistently at 269 kbps (or .26 Mb).
Over the past 2 years, we did try Comcast twice, which is super fast, under their $20 a month trial period (we did not discontinue Epix during the trials). Both times we decided against switching to Comcast, even before the trial ended, because it has a lot of momentary dropouts, sometimes lasting several seconds, sometimes lasting a minute or two - almost daily. Plus they had a few several hour ones.
So it seems the turtle (DSL) may be slower but it is rock solid consistent and reliable at our house. Seems the bunny (Comcast) has to stop for a lot of 10-100s. Also, Frontier's support has always been top notch, at least as when compared to Comcast.
As a retired IT guy, I can tell you it is not so much about speed as consistence. We have multiple computers on Frontier's DSL and there is no apparent slowdown when everyone is on at once. When my kids lived here, they played online games and had no problem with the DSL's speed.
Hope this helps.
PS. I should have added - you can test your download/upload speeds at the two site below. The first - Speakeasy is the defacto standard test. There other speed test sites out there but these 2 should be sufficient.
http://www.speakeasy.net/speedtest/http://rochester.speedtest.frontier.com/Try several locations since one may be slow so you want to get an average.