6B BE has more range than iMCF. There are two scenarios where 6B BE is great. 1) You're downed and the opponent is out of iMCF range, but in 6B BE range. He's attacking, but his timing is a bit late. 1/2 a meter for solid damage. 2) Your opponent is out of 2A and iMCF range (see a pattern?), but in 6B BE range. He's attacking you relentlessly and is clearly at disadvantage. 1/2 a meter for solid damage. I've used 6B BE while downed a number of times against good opponents and they're not prepared for it. It's honestly the best BE he has, imo, because it's the only one that's useful outside of a combo. I haven't done enough research for scenario two, but I'm positive there are situations in which a character would normally be safe, but not against Yoshi's 6B BE.