The dual tuners mean that you're also able to record one channel while watching another. Of course, it also means that you can record two channels at once. With most modern TVs having built-in Freeview tuners, we think it's fair to say that most people aren't limited by what they want to record any more.
Conclusion
If you've still got a standard-definition TV, we think you'll love the TVonics DTR-Z500. The picture quality via Scart is superb, and will look great on an older CRT. Sadly, the lack of HDMI makes it a less attractive proposition for flat-panel TVs.
Overall, this sturdy Freeview Playback machine does what it says on the tin and will suit people looking for a simple but comprehensive digital recorder. We used a good-quality Profigold Scart cable for our testing. Spending a few extra quid on analogue cables can really help with picture quality -- don't go mad though.
Alternatives include the excellent Humax PVR-9300T, which is available for around the same price. Given the choice, we'd probably go for the PVR-9300T, given the more flexible output options and HDMI.
Edited by Charles Kloet