Thanks Tom. Partly based on what you said and some things told to me by another engineering collegue of mine from the USA west coast, who is also doing USB work (albeit with PICs), I have decided to order the Swiss ElliSys unit. My application is a complicated multiple endpoint design and the software only tracer is clearly not going to be enough!!

And the price of the unit @ $899 US is quite a bit less than some other hardware assisted units. I saw prices as high as $31,000 for top end manufacturing test and USB certification devices.

Michael Karas