I have a highchair that was given to me - it is the traditional metal frame with flip up tray. It's bloody awkward getting DS in and out and he's only 6 months. (Plus I live in a flat so it's taking up vaulable space!) I have been using the bumbo instead. I was thinking of getting one of those cloth chairs that you attach to any seat - has anyone used them exclusively? I would just push him up to the table instead of him needing a tray. I can't see a problem with this? I think I've just been blinded by the Mothercare 'you will need the following....' list!
We have one of those plastic boosters and it's great for visiting friends and family and taking on holiday etc
for day to day use at home though we have a couple of wooden highchairs from IKEA that cost £30 and have no tray so pull up to the table and take up no more space than a standard chair and because they are wooden fit in with our decor nicely. The bar can be removed to make them into a big boy or girl's chair when they are older as well so none of the too big for a highchair/too small for a normal chair issues. If budget is a concern though, the £9 plastic IKEA Antilop is just as good.
I've tested some highchairs for a magazine and really hated the plastic tray confections; they take up way too much room and look horrible as well as isolating the baby from the family as they are two feet back from the table and any spoon feeding needs to be done at arm's length!