Sidekick III - going to USA

Any UK traveller used a TMobile Sidekick III and can give a (European)
review/perspective? I am used to UK mobiles (styles, useability, size,
function etc.) and so was hoping someone could give their 2p worth of how it
is. So many USA mobiles are flip (went into a US store not long ago and IMHO
I think we are way ahead than they are!) and have the ghastly antennas
sticking out of the phones. Hardly any nice SE (IMO) phones.
Thanks very much.