ClimaxDigital is the UK distributor; the stick is actually manufactured by mainland Chinese company Forward Video Co. Ltd. and on the box it is named "ezcap USB 2.0 DVB-T Stick", model number EzTV860.
I successfully installed the driver and TV viewer application in 32-bit Windows XP Pro and it works well and is straightforward to use.
But I actually bought the stick to use with Linux (a 64-bit distribution with the 2.6.32 kernel), and with that it does not work. After examining the Linux installation software dated August 2009 on the supplied CD I discovered that the supplied driver is only for Linux kernels up to version 2.6.29, so if you are using a later kernel then you're out of luck.
Presumably Forward Video will create an updated driver at some point in the future, but I could not wait for that to happen so I then forked out more money and bought a different manufacturer's stick that has a driver built into the kernel since version 2.6.30, rather than the external module approach used for the EzTV860.
The demodulator chip (AF9035) in this EzTV860 stick is relatively new and I only know of two or three DVB-T stick manufacturers that use it so far. Presumably support for this chip in Linux will improve in future, but that is no use to me now.
I did try the stick with a 32-bit Linux distro and a 2.6.28 kernel and it did work under that configuration. Although the manufacturer bills the stick as working with Linux, I found no mention of the kernel versions that it works with. It's a pity that neither the manufacturer nor the UK ditributor ClimaxDigital publicise the fact that the current version of the driver on the CD only supports kernels up to and including 2.6.29.
As I have found it does work in both 32-bit Windows XP Pro and in a 32-bit Linux distro with 2.6.28 kernel, I'll award the stick four stars. But it is annoying that it is not made clear that the current version of the driver (dated August 2009) does not work with the Linux 2.6.30 and later kernels. Had I known this I would not have bought it and wasted many hours trying to get it to work with my installation.
The supplied mini aerial is useless: I had to connect my house external TV aerial to the stick to be able to detect any channels.