I travel a lot for business and have to spend weeks away from my trombone, so it great to find a device that can help keep your chops in some sort of shape. Although I have used a couple of different buzz aids, the Warburton Buzzard is without doubt the best I have found to date in the market. The resistance feels very similar to that when blowing an instrument and its lightweight design and robust construction makes it ideal for travellers. Combine it with the Warburton P.E.T.E and you have a good maintainance toolkit