Not sure what level of DSL you have, but I doubt you'd hit a bandwidth bottleneck using it multiboxing. I have a 1/3M service, and I 5 box plus run a vent server with 5-10 other people attached (at high quality settings) with no problem.

So, while I doubt you'd notice much of a difference there, the difference in other areas is pretty significant. We have a FO service here which is 10M, and it's great. Never underestimate waiting less time for downloads.

A weak point IMO with DSL is that it's running over a copper pair that is buried in your yard. There are all kinds of reasons why these lines fail, and when they do, it's not a binary failure, it's a signal degradation which sucks to diagnose. At least with optic technology it either works or doesn't.

As far as ping, there is very little difference between the techs themselves in this regards. However, many CLECs will use certain hardware settings (DMT signalling in my case) which can cause ping issues. In my case, this DMT causes a 40MS delay, which pisses me off, but Qwest refuses to remove it even though a lot of knowledgeable people have told them that it isn't always necessary. I've yet to hear of anything like that with FO, at least in my area.

Hope that helps.