They are often second hand on eBay too, with a postage cost, so worth a look. But if money really isn't an issue, you could buy the set new and if you're planning to have a second child keep an eye out for a 2nd one second hand as you won't need all the extra bits for the older child.
We love that the kids can pull them in and out and can just climb up themselves to do a jigsaw, get down for toilet etc. I think it really helped with using cutlery properly as they could reach easily. Our children are about 25% for height, so quite short but quite capable.
They had standard hight chairs with trays at grandparents which never fitted well at the table for dinners etc. and they always are better when we were sitting together at a table compared to being given food in a high chair tray without anyone else eating. They are now in normal chairs with cushions at grandparents as have outgrown the 'baby' chairs that were there. They still don't eat as well there, as more difficult to reach, arms are at wrong height etc for the table. With the Tripp Traps at home, we just adjusted the seat and foot rest after each growth spurt to make them still at a good eating height.
I haven't seen the hack option, but if you can get them on and off the table independently and adjust seat and foot rest, it is probably equivalent to the Tripp trapp for those functions.
We also use the chairs to cook together as the kitchen is a tiny galley one, and we chop food together at the table, make rolls and cakes there etc.