3.2=factory fuel injection manifolds. Not some kludged add on like the bitz. Typ sell for ~$800 w/ everything but since you dont NEED everything deals can be found. Single TB makes tuning easy. Pretty simple mod to fit a real TPS onto the 3.2 TB. Bitz doesn't use one so throttle response will suffer (fairly well documented). Not sure if you can put one on the <=3.0 TBs or not.
TWMs can be cheap (enough) if you look (long enough). I have 3 sets
Cheaper than carbs for sure. Tuning is slightly harder.
Have OldTees 3.2 manifolds on the 914 for now. Have TWMs on the 911. Plan is to eventually put the bigger TWMs on the 11 and move the 40mms to the 14.
Surface mount + connector is what sold me on the microsquirt. The box isn't really waterproof but could be sealed easily. The connector *IS* waterproof (we used the same ones on our fork truck/golf car drives @ GE). The DB25s on the old megasquirt would never be long term reliable in a high vibration environment. The new microsquirt is a serious contender.