HI Benelliboy,
Unless you will be shooting 3.5 shells at geese, there is no reason to buy the SBE model. This is the only major difference, and the M2 will be lighter.
I've been bird hunting all my life, and not once wished for a 3.5 inch shell for geese!..........you can kill any duck or goose with Remington Heavy shot in 3 inch..................much better than steel.
I love my M2, and shoot better with it than the Beretta 391. Shot a 23 on 5 stand sportings, level 4, on my third round with the new gun..........and shoot consistent 22-23 on trap at the 21 yard handicapp...... about a bird better than the 391, and mostly psychological, no doubt!!!