Personally I wouldn't bother with AL, the likely result of spitting flames/noise is likely going to cost you big time from the bill at some point, it's certainly NOT something you want on all the time.
There will be an amazing difference over a car mapped on rollers as opposed to a off the shelf chip, where the FULL benefit of your engine can be gained, a chip by it's nature going on all manner of engines in different states of health has to have limits, if your engine is healthy you could almost definitely get more, if that were not the case there would be no point/gain in live mapping!!
If you want to swap ecu's I would stay away from the "bind" of the L1/6/8 ecu's, and go fully aftermarket, the G4 from the likes of danny at EP are well worth a look.
Try pricing up all the cost of WS/AL/LC/L8 then look around and the cost will hit you of the L8 stuff.
tabetha