Yeah I think everyone will have a different opinion based off what they drive or their experiences. Based off the reading I have done on these forums it definitely seems QDII is the most superior jeep 4x4 system; however, I am 150% fine with QTII Hemi....I found the "slippage" quite fun and challenging :P it seems as long as you get more experienced with the QTII and learn the system then you can get through anything that QDII will (Same XK setup as mentioned)