This chair harness folds into a very handy drawstring bag, which makes it super light and portable. The instructions are cleverly on the label attached to the product itself, so no chance of losing them, which is a big plus when you are suffering from brain freeze whilst coping with a wriggling baby / toddler. Once you get the hang of it, which doesn't take long, this product is so easy to use. It has so far fitted around a good assortment of chairs, though do bear in mind that the chairs need to have some kind of filled in back - even if its just bars, otherwise, this product becomes redundant.
We started using it with our daughter when she was around 9 months old, she has always been very upright for her age and it was certainly useful then, though I would say that now she's just turned 11 months, she is much happier to be in it, which means she will stay in it for a longer period of time, which is very handy when you are out to lunch at a restaurant, where you really don't want your bub crawling round the floors ankle biting.
All-in-all, we are really happy with our purchase and would happily recommend.
Grobag - Chair Harness - Gro-ing Places