Anyone used a proper detailer for their BMW, not just a car wash?

I've had my 330i for three years and it's never had anything beyond the standard wash and vacuum, which is probably why it's looking tired now. The seats have that shiny worn look, there's crumbs in places I didn't know existed, and the paint just doesn't pop like it used to even after a wash. I'm not looking for a quick shine, I want the full treatment, interior shampoo, leather conditioning, engine bay, the works. A mate at work mentioned he'd had a genuine BMW complete detailing service in Musaffah Industrial and said it was a different level compared to the usual wash places, but I'm curious whether it's actually worth the extra spend for a daily driver. Also, how long does a full detail usually take? I can't be without the car for two days. Would appreciate hearing from anyone who's done a proper interior and exterior detail on their BMW and whether it held up in this climate.