RHEV: Virtual Desktops & Thin Clients

Is there anyone else out there using RHEV for virtual desktops? Are you using thin clients to connect to these (Linux or Windows) guests in RHEV?

We have a few virtual desktops, some Windows for user testing and some Linux for developers. Outside of testing, we have not used thin clients with them, as we have not found thin clients that have support for SPICE that is on par with VMWare View, Citrix XenDesktop, or RDP. With those other protocols, there is software built-in that lets you configure a session completely, so that all the user sees is a "real" PC desktop. The best we've come up with on SPICE is logging into the RHEV user portal via a browser. The user portal is a great, flexible option, especially for developers or system admins who want lots of choices (and desktops), but it doesn't work for presenting a single, seamless desktop to a regular user. For example, it won't work in a library with public kiosks (with auto logins).

So far the best thin clients for RHEV that we've seen are IGEL, and they aren't particularly good, supporting SPICE (version 0.8.3 of the old spicec) via a browser plugin only. I'm hoping someone else has either found a thin client with better RHEV/Spice support, or has come up with a home-grown solution. If you have, even with partial success, please share!