I have never had any of my clients personally buy this one from Toby Churchill,  but I did see it demonstrated and thought it was sleek and portable:
http://www.toby-churchill.com/products/micro-voice-amp/
I think all amplifier companies boast reduced feedback or distortion, but you really don't know until you try it out.
Rachell
Sent from my iPhone

> On Sep 1, 2015, at 5:00 PM, Costello, John (Otolaryngology) <xxxxxx@childrens.harvard.edu> wrote:
>
> In clinic today, after trying several voice amplifiers across the price spectrum and both wired and wireless, a patient identified the Luminaud Spokeman as the  one he found clearest with the least feedback or cutout (Bulbar onset so small and portable is a priority for him).  He then asked me "If money was of no object, what is the best, small, high quality, no feedback and no cut-out amplifier there is?".    Knowing I have a limited arsenal, I thought I would put the question out there.
>
> What have others found?
>
> Thank you!
> John
>
>