Just reviving this thread as I stumbled on it by accident. I have had a 4 string fretted version since they were first released in the UK and I love it. It's light, ergonomic and easy to play. However, the point of this post: the drawback of all piezo based pickup systems in my experience is that they can produce a tizzy, brittle tone at some frequencies: nasal is another way of describing it. I haven't particularly noticed it on the SRH500 to be honest (nothing like as bad as my Taylor 6 string acoustic) but you can make it sound really good by using an acoustic correction pedal like a TC Electronic Bodyrez, or even better a Zoom acoustic pedal like the AC-2, which has a dedicated upright bass voice. Using the AC-2 and some EQ tweaking, I can get a really convincing upright bass sound. Like they say on the BBC: other acoustic pre-amps are available. Obviously, it would sound even more authentic if it were fretless but I am happy with the sound I can get out of it. Incidentally this works pretty well on my Ibanez Affirma bass, which also has the aerosilk piezo pickup system in the bridge.