My next mod. Before I spend the money I want to know most everything there is about it

1.) First is it worth the money?
2.) How much do you really gain (real time numbers please.)
3.) Does the installation of it cuase problems down the road?
4.) After the intial cost of the s/c itself what else is needed and how much does it cost in the end?

**5.) For the owners....Would you recommend it?

Thanks