DJMyer

I have an 01 bone stock 4.0 WJ. It is my daily driver but I want to lift it and add some tires for looks (obviously) but also so that I can do some wheeling from time to time. I've been looking at IRO kits and have narrowed it down to either the 3" or 4" kit. My concern is mainly with my front drive shaft. It's a double rezeppa and I have found posts saying that I would absolutely have to replace it then I have found some that say it may work. So first of all, I'd like some feedback on the drive shaft subject. Also, opinions on the IRO lift? Ride & drive quality? I also see that a lot of people use wheel spacers with factory wheels? Is there a reason/advantage to this?
I appreciate any and all help and guidance.

Thanks!