Useful
I had an ironic state of play with Yodafone when I switched across recently: after having been on the network for 3 days, I noticed signal was poor to nonexistent in the study where I work. Recalling that the Access Gateway was free to new users with a tariff over £15/month (not just the £160 flat-rate mentioned in this article), I asked for one free; yodafone tried to tell me that it should have been specified at time of purchase (when I didn't know how bad the signal was here!) and couldn't be bolted-on afterwards - a mere 3 days, "new" enough to be well within my statutory cooling-off period on the contract and yet not "new" enough for the purpose of an Access Gateway? "You'll have to return the connection and get a new one", with implied downtime.
Yeah right.
Eventually, with some assistance from their twitter staff instilling sense in their customer services, they sent me one out. Having 3G around the house is a total bonus - both my other half and I benefit hugely from it now with blackspots eliminated.
There have been a couple of significant downtimes but nothing so huge that I couldn't use 2G instead. It's quite funny when you haven't noticed but get an SMS *after* the outage to say "sorry, something might be wrong with it".
For those questioning why: 3g uses far less battery than wifi and you can't route calls over wifi directly.