nothing wrong with a pair at twenty.... they are decent but not first world class quality, so buy a spare while you are at it, besides levers get broken often and you will have to likely do some cable work to make them work on your bike
regular levers work much better and good heavy chrome plated cast brass ones last much longer
the bar ends make routine and regular cable maintenance more tedious
you know, injecting dri-slide and greasing the cable ball ends
then don't forget you have to make holes in your bars for the cables to exit from them and deal with any conflicts you may or may not have around the busy or barren trees
I've seen a few cafe types with them but I usually seem to manage forgetting mirrors on my bikes
the ones I've seen with mirrors just used short stem clamp on type mirrors either under or over the bars
often I forget to wire up a brake light too
just my two is all
I'll have to dig up pix of some genuine Magura racing levers I had a while bike, a pair of them didn't weigh a pound including perches
the vintage BMW race guys tell me they only last a race or two, if you are lucky
they are really very feather light
