Hope
this helps
If not try searching that forum, Wiz is a bit of an autocom erm...Wiz
I've had no probs at all with my pro avi 300, mind he helped set it up.
Like Brian said Wiz knows quite a lot about Autocom kit. Though do bear in mind that the thread linked to is about 6 years old and things have moved on since.
I have had Autocom Active Plus and now a Super Pro Avi, both these are from the 2006-2009 range. I found, through trail an error that speaker position is absolutely critical to an effective install. In both terms of alignment of the centre of the speaker with your ear canal and proximity to your ear. I have mine mounted under the lining of my Arai Quantum with home-made foam stacks (you can buy these from Autocom as well) bringing the speakers lightly into contact with my ears. All day comfy though. Set-up thus the system works very well with my regular Max Lite ear plugs.
I can only assume that similar attention to this area will improve any bike intercom system by a considerable amount.
I went from being able to just about hear at motorway speed to having good audio at 80 and acceptable at 100mph.
Mic position is also critical, you need to be able to touch the mic with your lips if you 'pucker up'.
Works well for sat nav, phone (currently via old style Autocom Bluetooth module), bike-to-bike and music (from sat nav or separate MP3). I got the new special Autocom 'Garmin lead' for Christmas but have yet to fit it. Should enable phone via the sat nav once done.
My Super Pro Avi cost £43 off eBay complete with cables (from regular kit) and headset, I think I got lucky. Having said that I just bought another Super Pro Avi for a eBay phobic m8 for £105 but this included lots of extra goodies such as isolated leads, Bluetooth module, three headsets etc. Admittedly I've spent a fair bit on isolated cables, Bluetooth module, radios, BO antenna kit, PTT switch, pillion headset etc. (mostly on eBay). Very happy with the system as it stands, everything bike powered, usable up to 3 figure speeds as tested last year in Germany (sat nav, music and bike-to-bike).
I can see the appeal of Bluetooth headsets, my touring buddy has an Interphone f4 but the bike-to-bike options are limited for group riding (we tried a Tribe but it got sent back for a refund, enough said). Needing to charge them each night can be a pain, especially when camping but I suppose the counter argument is that the likes of Autocom have cables between bike and helmet.