Welcome to the forum.
I don't know for sure, I don't have a BHS-701, but my guess is that it is very likely to be supported. These quotes from the Iqua web page (http://www.iqua.com/products_sub.php...d=1228&id=1230
) make me think this:
"The Iqua BHS-701 can be used with any brand of Bluetooth mobile phones that support the Headset or Handsfree profiles"
My comment - The Touch Cruise Supports both these profiles.
and "For stereo music, the device must support A2DP profile (Bluetooth stereo)"
My comment - The TC also supports A2DP (see page 166 of the TC manual).
This is no guarantee but these profiles are supposed to be standardised to enable interoperability like this so, as long as neither HTC nor Iqua have messed up on their implementations then in theory it should work. Personally I would still want to hear from someone who actually owns one though before spending my money or else make sure you buy it from somewhere that offers a good return/refund policy in case it doesn't work.