Bolt rope main needs to come all the way out the bottom of the mast track to get it down completely, whereas slugs or cars the sail can flake on the way down. It might work if your track entry is reasonably high above the boom, but normally you need to pull the sail down to the deck to get it all out.
They do work with a bolt rope, but like what @MiddayGun said they work best with a high track entry. We have an older Doyle stack pack that allows the family to to sail with me without the drama of dropping a main sail and trying to flake it on the boom while the wind had other ideas. still requires someone at the mast to pull the sail down and out of the track. The stack pack and lazy jacks makes it so that the person at the mast just has to pull down large flakes on either side of the boom while playing the halyard with their foot. would be better with cars or slides but still very doable!
Mine wraps around too but it isn't under tension like the one in the photo, so there's a zippered front panel. It's nice in a way but I have some mast-mounted clutches and other bits underneath that I need to get to when at the mast so I'm frequently unzipping it to get to stuff.