That one looks good, but the downside is that you have to plug in the cable manualy, it is not specific to Desire HD.
I got this one, for 2 reasons; 1st it is for Desire HD and second it is cheapest I could find but quality is not bad:
http://www.sunnysoft.cz/zbozi/105PKI-033/kidigi-drzak-do-vozu-pro-htc-desire-hd.html
It sticks to the glass OK, the device is firmly inside and cand fall out. You don't have to think about plugging in power cable since it is integrated - you just push your DHD inside and it's done.
the downsides? Yes, it makes slight noise when you drive on non-flat surface or at high speeds, like "click-click" type which can be annoying after a while. I dunno if the problem is with Desire or mount. It is pretty hard to remove the device from it, you have to be careful and do it with both hands. Once the bottom cover on DHD simply opened and stayed in the cradle

But this is not mount's fault but DHD's manufacturing....
All in all it is relatively inexpensive and not that bad...
D.