In reply to Cadairmanuk:
if you want to progress then chuck the leashes and get a decent modern pair of axes with a good grip rest. the main issue with the standard flys is they are fairly straight shafted which means your knuckles will take a bashing and you won't get good clearance on ice formations.
i have always been a fan of my dmm rebels but these have now been superseded by the apex which i'm sure is a good axe too. you might also consider the petzl and black diamond equivalents.
i generally don't bother with clipper leashes since they add something else to get tangled in.
i am not sure if standard flys with no triggers would be good practise for anything....it might marginally increase your grip strength over time but is a good way not to enjoy any of the climbs you do.
it makes sense to use the best tools at your disposal these days, so looking at the current dmm line up i am not sure how the fly does anything better than the apex? i think dmm are really just catering for traditionalists who don't want to update.