We have this one as an alternative to a high chair. Very comfy and can be used with or without the tray (tray is quite small though). Bit like a Handysitt, but with the tray. Folds into a carry bag, and is quite light. We use it daily and it is still in good nick. The covers wash in the machine very well (covers being the one disadvantage compared to an all plastic one that can go in a dishwasher).
We looked at the Mee Too (love them in Wagamamas), but you can only use them on tables that are totally solid - something we couldn't guarantee when travelling.