Nope, I like the lefty's. I even tie it onto worm hooks instead of the uni.
I use BM 20 and 30lb FC and the lefty's always held pretty well. Had one in 30lb hold so well that it pulled straight through the eye of the TT jig head.
I reckon just go with what works for you though, my mate hates it and can't get it to hold so he goes the genie and uni too.

I use it all the time and its the cheap black magic thats the problem spend the $ and get some yo-zuri trace from gofish its the ducks nuts mate i had the same problem the crap frays when knots are pullet tight with the youzui if i get a snag i can lock the reel and hold the boat side on in a drift with 15lb try that with black magic wont happen

Nothing wrong with BM FC but Yo Zuri is good too, personally I think Seaguar (for the light stuff) is the best I've used but honestly I use more mono than FC anyway.

Couldn't agree more with what Wayne said, its not the knot that's the problem most of the time it's the persons competence with the tying of it, what ever knot you use.
There are plenty of knots that the majority of people use that I can't tie very well, like the spiders hitch, mine snap all the time, so I don't use it, I use what works for me and thats the bimini.
Learn and try as many knots as you can and stick with whats best for you, you'll be a better fisherman for it.

Ok, thanks fellas. 

i've found that flurocarbon is also way harder to tie than nylon...
for my knots i just go with the good ole' trusty uni knot tied up to my finger tips.. hasn't let me down so far.
for my trace to doubled braid i use either an improved albright knot with a small touch of superglue for extra strength, or a back to back uni which is also successful for me..
before i got my 4lb braid set up i used to use the spiders hitch every time but when i went to tie it on the 4lb i'd pull it with my hands and it would snap easy as.. now i use the blimini twist, and haven't had a breaking yet.

it's not the knot it's the knot tier, like wayne said..
once you have tied the knot compare it with a picture of what it should look like and if anything looks wrong re-tie it because it will not be as effective.

Ye thats exactly what keeps happening to me, but it doesn't seem to happen if you wet it first.

Back through the eye of the granny knot yea thats it.

Edit, although I do 6 turns but don't think it makes to much of a diff.

My choice is still the trusty old uni-knot.

i never wet my fluro when tying the knots. its better to "tease" the loops back up the line and gently tighten them. i use 4lb flouro when trout jigging and dont have a problem with the knots.
just be more careful when tying the not and all will be fine.
when using the leftys i go back thru the "y" loop and not throu the granny loop. this may be the diference.

Would you agree with the lots of lube on the knot before pulling up tight Clark ??? made a big difference on the line tester