The user interface is simple to operate and provides enough control possibilities, of the frequency and passband adjustments, to satisfy casual listening and sampling of the quality of reception that is possible with a SDR ... even a "bare-bones" one!
One can hop from one band to the other in just one click. Available bands are:
3.576 - 3.624 MHz
7.032 - 7.080 MHz
14.137 - 14.185 MHz
Once you get the hang of the waterfall display, you can easily spot a SSB signal (for instance) and slide over to listen in.
Compared to the old way of "tuning around" blindly with a VFO dial, the waterfall display is a very enjoyable feature of a typical SDR user interface.
When you own a full-fledged SDR, and with a little practice, you will be able to recognize different modes of communication used in ham radio (SSB, SSTV, RTTY, FAX, etc) on sight on the waterfall and "slide" over to tune them in. Very neat stuff!
Another one I like very much is the WebSDR receiver/server located at Walla Walla University's amateur radio club station K7UEB, on College Place, Washington, on the West Coast of the USA.
Ham Radio Online Receiver K7UEB Grid Location DN06TB URL:http://outside.wallawalla.edu:8901/
This one only gives access to the 20 meter band (14.102 - 14.198 MHz).
On the other hand, I found that this server is located in a less noisy location than others. Part of the explanation might be the antenna, a Mosley Classic 36 at 90 feet!