Had this done last week, essentially just cutting out the long box that runs between the front seats underneath and replacing with a straight pipe. Impressions are good, it's about 10% 'better' overall. A bit more roty/burbly on tickover, a few more pops/bangs (but nothing too loud/obtrusive) and bit louder on harder acceleration. It really seems to make it sound like I feel it should have straight from the factory. It sounds like it is a sports car now but one that is also fine day to day (mine is). As a first, low cost step at improving your exhaust I'd say this makes a lot of sense. Mine cost £60 to do.
Its not loud enough to make a video worthwhile tbh. Although at the moment i have the rear seats down and that makes quite a difference!
Mine has been done as well, and it's great! With the seats down you can hear all sorts of pops and bangs. Go out and try heel-toeing down the gears!
Mine makes insane pops and bangs lol, it makes me grin from ear to ear a massive difference on my car anyway. Car sounds more throaty and aggressive without droning.