Balloon knotting tying tool????

Hi, I usually do face painting but my daughter's begged for a balloon arch for her bday party I did a balloon arch and some decorations...I am getting interested on adding balloon twisting and balloon decor to my already established face painting services. However, my fingers were hurting so bad!!!! I have an inflator but gosh, I am looking for a balloon knotting or tying tool that would make easier to inflate and tie a couple of hundred of balloons required for an arch and two columns... did any one try this product ? http://www.clownantics.com/balloon-accessories/the-balloon-tool-instant-balloon-tying-tool-1048-14-p.html or any other tool that you use for knotting balloons?? thansk a bunch !
Betty

I've heard that it's ok, but I think it would really slow you down. I haven't tried it myself. I'll grant that after 14 hours of twisting free to the public, my fingers were pretty sore, but it isn't usually an issue as events that large are only once or twice a year.

Thanks for the response but personally I wouldn't do a balloon arch with my naked fingers ever again... i need a tying tool !!!!