We are paying all the fees for our kids. We're medium-higher earners now, with a joint pre-tax income of about 170K, though for many years I was very part-time so earned none-much lower. Currently my pension and car scheme keep me just over the threshold of the higher rate tax. DH has been a higher rate tax payer for 20+ years.
We both have good pensions, but we also decided early on to save for our kids' futures. We are in NI so fees are currently £4250 (or something like that!). We are paying all the tuition fees, accommodation costs and a small monthly allowance (£120ish) - the kids do/will top this up from money from part-time jobs. We have saved enough to cover this and to help them with a house deposit, in fact we've already started putting the max yearly amount into a LISA for them, in addition to other savings in our names.
While we are very fortunate to be able to do this, it was a deliberate decision and has only been possible because we have always lived well below our income. We bought a biggish house years ago, stretching ourselves a bit at the time but haven't moved since, though at times I've been tempted! We don't have fancy cars, we don't have expensive holidays or buy expensive furniture or clothes. I know that a lot of DH's colleagues, earning the same amount, haven't made the same choices - they have nicer houses, have had significantly more expensive holidays and in general their spouses haven't (eventually) worked/earned as much as I now do. Their kids took the tuition fee loans and in some cases the minimum maintenance loans they were eligible for.
All this is a very long way to say that while many families have no choice, and many see it as a graduate tax/something you'll never pay off, the possible impact of paying an additional 9% tax every year for decades was a burden we didn't want our kids to carry. We have a nice life and haven't suffered, but we have definitely and deliberately lived a lower 'standard' of life in terms of housing, holidays and cars compared to our income - I think it's worth it.