Superchargers for 4.0

Anyone have any experience with superchargers? Looks like the top 2 for the 4.0 are the kennebell and the avenger. I haven't ever messed with them in the past but thinking of it for my jeep. Just really paraiod about spending that kinda money for something that I can't get to work right or causes major motor issues. which one is better? Pro's and Con's? Here are the links. I haven't really found any solid reviews that didn't appear to be biast.

http://www.kennebell.net/super…wrangler40/wrangler40.htm

http://www.avengersuperchargers.com/

I know I posted something close to this before and got some great feedback but was still wondering if there's anyone in the group who actually has supercharged thier 4.0?

I was thinking of either stroking out the 4.0 or supercharger on mine, but the stroker kit was 2600$, fule injectors another 600$ plus I'm sure there some odd -n- ends stuff to tack on more money. The superchargers are in the 3000-4000 range. Jegs has a new, not remanufactured, 360 motor for close to 3000$ with way more power
http://www.jegs.com/webapp/wcs…001_10002_750392_-1_10763

Thanks for the responses. I've pretty much decided not to go with an engine swap for now. I only have 20k on my 4.0 and I'm thinking that although I may be able to get a small block v8 for relatively the same price..........there will be much more expense in other parts that I'll have to upgrade to support the V8.

I'm just trying to find out form some folks with hands-on experience what type of challenges were encountered when super-charging a 4.0. Most of the online articles I've found seem to be rather slanted to a particular brand. For example, Kennebell spends alot of time talking about thier module for the CPU calibration. Avenger doesn't even mention it.

All in all, I'm tyring to figure out everything that I'll need to get this thing working to it's fullest potential so I can get a true $$$$ estimate. THis is my daily driver so I can't afford to have it down for long periods of time while I'm playing with calibrations and sensors and things.......................