ive used this a couple of times sparing (probably 5-10 times in 3-4 months of training) and each time as long as i set it up with some good leg kicks it lands probably cleaner then anything else ive ever thrown.
again as long as its used sparingly, you dont want to become someone who uses this a lot, but it is nice to toss at someone who doesnt expect it, you can really get some good power and distance.
Plus its fun to throw and a crowd pleaser, but it isnt something you dont want to throw 3-4 times in a round.
imo.