Joggler tool, worth it?

Have any of you guys used a joggler tool? I am thinking of buying one to line up the repair panels to and to help get the repair panels sitting flush with the original metal. What you think?

Hi

I have a hand joddler from Machine mart . Good bit of kit BUT …. i should have bought the air powered one . Reason being that the hand one does not produce a good step in the panel but the air one does and being air powered you can make loads of passes until you have a good step for welding . Its all down to the effort required , and sadly the hand joddler is just not up to the job , also it has a punch at the other end and i have found the hole too small to get a succesfull weld in when button welding .  

Cheers……….

Mmmmm. Thanks Chudd. I have no compressor at home yet so air powered ones are out of the question. I will stick to doing butt welds then.