He is talking about the LA1034 LogicPort which provides 34 channels sampled at 500MHz. Ah, how do I respond? I haven't got that one so I can't say for sure. I would suggest Google "compare LA1034 Saleae". You see some interesting comments.
One point of difference, raised in one of those posts, is that the Saleae Logic samples at 24 Mhz for a simple reason - so it can stream the samples via USB to your PC (or Mac, in my case). Now the faster analyzers have to keep the samples in internal memory, which in the case of the LA1034 is 2K (per channel). Now admittedly they use compression (ie. noting changes, not just every sample) but if you have at least one channel that is "clocking" (eg. an SPI clock) then the compression won't do much, and you run out of samples after 2K.
By comparison, the Saleae Logic can stream 10000M samples (ie. 10G samples) to your PC. That's a lot. And it means you can set a trigger on something early (like, turning the gadget on), and look for things which happend 10G samples later.
If you want to see what I have done with the Saleae Logic device, check out my posts here:
Most of them have screen captures from the Logic. Things like switch bounces are clearly visible. You can see the SPI clock. And as I said before I could follow low-speed USB. Now high-speed USB is too fast, but then, 2K samples is not enough for high-speed USB (for any serious analysis), so the faster unit wouldn't be much of a help.
That raises another point, the Saleae Logic runs on Mac and Windows (and Linux I believe). So if you are a Mac user that might influence you.
Anyway, have you guys found any logic analyzer that has an extra of analog signal reading as well?
Or do I need an oscilloscope?
It's called a mixed-signal scope, and I would love to have one. In fact, I have a Bitscope which does that:
http://www.bitscope.com/
However personally I just find the Logic really easy to use. It is small, it just sits on the disk virtually unnoticed. The software is pretty easy to use. It does the job.
But, don't take my word for it. Try Googling "compare logic analyzer" and see what other people think.