I've been struggling getting the #49 set up. I've used the #48 before and didn't have any problems, though needed to fine tune the groove a bit.
The vintage Stanleys have 2 cutters, so getting them set up is very fussy. I had a chance to test the L-N 48 about 10 years ago when I visited the showroom. At that time it was a prototype and no 49 had been made. As expected it was a solid plane that felt great in the hand. Clearly a step up from the Stanley. Does anyone know if the LN blade, which is a single blade with a slot in the middle, will fit the vintage #49? I called LN, and the nice young lady didn't know. I could always get one to try, but thought I'd ask here first.