Thanks for your comments chaps.
Landsknecht - Donnybrook is very similar in concept to M&T. I have now played both sets and think Donnybrook gives a more intuitive game in that we were barely referring to the rules and rattling through the turns a lot quicker than any M&T game I have played.
I like both sets and would happily play either, I think what particularly appeals with Donnybrook is that it gives you a well engineered basic set of black powder skirmish rules that leaves you plenty of scope to bolt on as much additional stuff that you care to.
A bit subjective, but I rather think most of us end up selecting the rules we like on that basis anyway.