yep im using one and like it alot actually, you need to remember though your modfiying the stuff the stock ecu does, it is not a stand alone ecu so your still limited to certain things which i dont conccider to be a prob i can easily see this setup supporting in excess of 300RWKW! my next upgrade to it though is going to be the add on map sensor
mine is a chaser jzx81 half cut and yep climate works fine just air con dosnt as the air con pump is screwed
i tuned it at mx83toy performance using a seat-of-your-pants dyno and an effective-listening-skills sniffer but seriously going to stick it on the dyno at hills motorsport to kleen up the maps alittle, they are quite switch on over there ....