The major issue with them is the lack of lounge access. It severely dilutes the proposition.
AFAIK, they used to offer it (as we used it many years ago), but on a recent upgrade, we could not.
I think severe is probably overstating it - it never ceases to amaze me how much a nicer waiting room and some free food and drink can tip the balance into "value" territory. That's about 40 USD of value, max.
Surely spending x hundred USD on an upgrade is all about the seat?