Timming advancers


Has anybody tried the electronic timming advancers? Some guy is selling them on e-bay.
Do they really make that big of differance?
Powercomander II but a word of advice you should have a shop install electronics for your bike its not a great idea to buy electronics via mail. Alot of times if the unit is defective after installation you might not be able to return it .If the shop installs it after you buy it via mail you will have to sign a waiver. the fact is they are very easy to install and you can down load your mapping via the internet.If you buy it from the shop they will cover any problems you have and even give you a free dyno run.Dyno run before installation and after:37: