i have a set of lister legatto trimmers. they are very good for chins/whiskers/top nots and fine feathers. they also work well with combs on to tidy the backs of fluffy hairy legs. dont know about the libretto ones but generally lister are a good make and do the job. but remember they are only trimmers and not really man enough to clip with tho fine for fiddly bits/ears etc.
Thank you  I've got the lister libertys but wanted something to replace my meteors. Sounds like they will be fine as only want to clip my mares face. Thanks again.