Thinking of migrating from TalkTalk to Vodaphone - Wise Choice for DSL (FTTC) service where the cabinet is some distance away?
I know people who are on or have been on Vodafone FTTC - no great surprise as VF are a mass market ISP.
I haven't heard of any particular issues with the service they had. One of them had an initial difficulty ensuring they were charged the correct introductory promotional price, but did get that resolved.
They also had success in having Vodafone (VF) get Openreach around to fix an issue with their copper dropwire entering the house from the pole - though I think this was actually an issue created by their builder (who'd had scaffolding up I think) cutting the wire and then bodging a junction box together badly! Fairly sure they didn't get charged for that (as strictly speaking they probably should have). Both interactions were a few years ago when Vodafone were pushing to enter the home broadband market and gain market share, so maybe things might be a bit different now.
As stated above, VF are a mass market ISP so don't expect miracles from them. I think there have been some issues in the past where their backhaul was struggling to keep up with demand but I think these have been temporary issues. I think VF by and large uses their own backhaul network (ex Cable & Wireless Communications) which, apart from the aforementioned short term capacity issues, I haven't heard any major complaints about.
Ultimately if you want an ISP with less scripted and more personal and responsive customer service then you need to pay a bit extra for it.