In short, we had quite a few 30-50 units, but they had many design flaws and have either gone quickly broken (keyword: planned obsolescence - and the growing mountain of waste and nature is charged) or you had, for example, very often hover around all the hair to get. The 1611 was purchased on 23 April 2014 and he runs and cuts so far very good. Should this situation change what this review will be updated.