We currently use MemSet for most of our hosting requirements. We run Ubuntu virtual servers and have very few problems caused either by us or Memset.
However, Memset don't provide out-of-hours emergency support except with fully managed servers (£40/month overhead, on a virtual server which might only be costing £10/month itself). This has occasionally caused problems in the past, with an upgrade taking place late on a Friday evening leaving the server inaccessible until after 9am Monday. It means we can't risk a major update out-of-hours in case of problems, but equally don't want to schedule downtime in office hours either.
We prefer to run multiple virtual servers rather than having one "big" one - spreading the load but more importantly meaning that one outage it less likely to hit all customers or all services at the same time (much easier to manage!). At £40/mo for multiple servers this means paying around £3-4k just to be able to contact emergency support typically once per year when we have a problem that requires it.
So, what are the current suggestions for hosts that other people can recommend with 24/7 support availability for those rare disasters? I know this type of thread crops up fairly often but recommendations change and I haven't seen the specific issue of out-of-hours support cropping up.
Other than this I have no reason to wish to move away from Memset, but we have reached the stage of migrating several sites to new virtual servers and that can either be at Memset or elsewhere, so I need to consider the alternatives.