I recently bought a Beneteau with in-mast furling thinking that it would be much easier to deploy than a standard main. However, having had a standard full batten main with lazy jacks on my previous boat, I can tell you that the furler doesn't save much time or effort.
I assumed that the in mast main would furl much like a furling jib. With the furling jib, it takes very little effort to uncleat the furling line and then tug on the jib sheet. Usually it quickly unravels as the wind catches it.
But the furling main, I always have to use a winch to put it in and take it out. While furling or unfurling, I also have to put some tension on the outhaul or inhaul to prevent wrinkles. Everything has to be set just right for the furling to go right: halyard tension, vang, mainsheet eased, topping lift set to correct height. One time a friend adjusted the tipping lift which then caused the sail to get stuck when furling due to overlaps.
The other issue with in-mast furling is the bad sailshape due to lack of battens. The leach is usually floppy because it is unsupported. While you can try vertical battens, the sailmakers I've spoken to discourage them because they cause more wear on the sail and can jam.
I find it to be finicky and trouble-prone. Maybe I'm still getting used to it because I've only had the new boat for around two months now, but if I was to choose again, I'd go with the standard setup with lazy jacks and a track.