Wow, 34 channels @ 500 MHz for $389 is great! Is the software decent? That seems like a better deal than the Saleae units.
I suspect it won't actually sample all 34 channels at 500 MHz though. Usually there's some multiplexing going on with these things, so you only get the maximum sampling rate when you're using 1 or 2 channels. Saleae's top of the line Logic Pro 16 will do 4 channels at 500 MHz, but with 16 channels you only get 100 MHz sampling. And depending on what you're doing, you might need 2x oversampling, so 100 MHz sampling might only be good for a 50 MHz system under test.
You could always connect two units to two different PCs if you need 68 channels.
I suspect it won't actually sample all 34 channels at 500 MHz though. Usually there's some multiplexing going on with these things, so you only get the maximum sampling rate when you're using 1 or 2 channels. Saleae's top of the line Logic Pro 16 will do 4 channels at 500 MHz, but with 16 channels you only get 100 MHz sampling. And depending on what you're doing, you might need 2x oversampling, so 100 MHz sampling might only be good for a 50 MHz system under test.
You could always connect two units to two different PCs if you need 68 channels.