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If you know what you're doing, the Megasquirt is fantastic. Cost to feature ratio is unparalleled, and I've put a hundred thousand miles on my DD while it's been Megasquirt powered. To top it off, it has OEM drivability, never surging or bogging, and you can reach in through the window on the coldest day of the year, turn the key for a half second, and it's running. The hardware does what the hardware does, it's up to you to tune it, though.
As for tuning, there are a few ways to go about it. The easiest is to take it to someone who specializes in it. I'm near Cincinnati, and I have an engine dyno cell setup pretty much just for doing Megasquirt installs that I build and wire, but I'd be more than happy to help you out for pretty cheap; I try to cut forum members price breaks where I can.
Secondly, with a wideband you can run a datalog while driving (assuming you've roughed out the tune to where you can drive it), then import that into excel or openoffice, and go back through and look at the recorded AF ratios at given RPM and MAP points, then do the math to figure out what the cell -should- be at to get your desired AF ratio. It's far from perfect, but I've tuned cars that way that ended up working very well, and without an engine dyno, it's one of the only ways to really tune the regular city driving areas of the map.
The last method would be to recruit a friend to drive around while you sit in the passenger seat with a laptop, and adjust as you see fit. Before I had my dyno, I used a combination of logging and shotgun tuning to get a reasonably good tune, but it is time consuming.
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