My Qtek 8310 works more or less fine, sound quality on the handsfree is a lot worse than with a friends Siemens S65 but I need the Qtek because of my job.
Only problem is, I always loose the first few seconds of each conversation, dialing out, as the the handfree kit kicks in with a 2-3 seconds delay, after the other side picks up. So the other side is going "hello, hello, hello" for a few seconds and I find myself always having to explain I didn't get their name etc. etc., which tends to be quite annoying in business calls, especially if you have call up the same number 10 times a day for weeks in a row and sort of make a fool out of yourself every time.
This means also that you don't get any ring or busy tone on the handsfree kit. It only kicks in "by surprise" when the other side picks up (or doesn't, if the lline is busy, and leaves you wondering why nothing happens). So I have to keep glancing at my phoen all of the time. Talk of a security bonus!
In all, the handsfree kit is absolute crap, a lot worse than the old kit in my last BMW, which dated from 2000. It really leaves my wondering if Lexus / Toyota engineers don't use handsfree kits, and though don't realize what :tsktsk: they installed.
Dan