Yep, Owens.
It's reputation for being unreliable comes from the many posts on places like Supraforums from people who have had failures (or at least say they have). It may well not deserve that reputation, I don't know, but it does have that reputation.
As for wasted spark, I agree you can sort it out, but then you have another thing to fit, go wrong, put extra strain on things. It's a disadvantage, just as Motec's pricing is.
You'll always get a kind of religious war with ECUs it seems between the various camps. They all have advantages and disadvantages. For me, the fact I didn't need a DLI, greater percieved reliability and build quality, greater flexibilty with things like injectors and the wider availability of tuners that would map Motecs were the reason I went that way. I also preferred the software. For others the extra cost and fact you can't control the autobox from a Motec may swing things the other way.