I have the Saleae logic analyzer to do some basic logic probing work (mostly debugging data busses), but semicolo is absolutely right, on a few occasions I have found the sample rate too low (the actual sustainable rate is something like 16MHz)
The Salea software has a very nice-looking GUI, its features are fairly standard - a scrollable zoomable display, different recording sessions in tabs, options to resolve various serial protocols (I2C, SPI, etc.) in hex or ASCII, the usual triggering options, measurement data (frequency, duty cycle, times, etc. etc.), various save/export/screenshot options. I wouldn't expect any more in terms of features from logic analyzer software, and I commend the interface for being very well presented and very intuitive and easy to use. You can download their software to try it out, it comes with a "simulation" mode which allows you to explore the various features.
On the physical construction, the Saleae is much smaller than it appears on the picture, being a nice 43x43x9.3mm anodised aluminium box with semi-rubberised underside. The 9 probes (8 channels and ground) come as a bundle of wires on a single 9-pin 0.1" pitch socket that plugs into the recessed headers in the device itself, cables and probes are of good quality, wires are probably a lot thicker than they need to be for a probe, but convey a sense of robustness. The probes themselves come separated from the cable, whose ends terminate in a heat shrinked connector, but it takes mere moments to plug the wires into the probes, the connection is solid and there is little chance of accidental separation. The probes have grabbers with 0.43mm width and have no problems latching onto pins or wires. The 9th probe is a ground connection, though the whole thing is grounded to the USB ground. Everything comes with a zip-up case that is far too large for it, and a high quality and surprisingly long USB cable.
On the balance, a great logic analyzer for basic work, if you don't need sampling beyond perhaps 16MHz. The construction and feel of the device itself is excellent, and I would expect it to last some time. Overall for my purposes I believe it was a good investment, it is hassle-free, pleasant to work with, with only a slight regret at the sample rate.