If your reffering to the usb adapter that connects to the tuner module out of a dish 6000 reciever, there's actually very little that it gets that a twinhan card or DVBworld usb adapter doesn't. It will get some 8psk, but that's only turbo 8psk and turbo 8psk is only used by dish network and most of that is going to be encrypted. It will not get trellis coded 8psk which is what some networks are now using for HD feeds to save bandwidth. Also one of those adapters will tune to DCII signals but you'll only be able to get video on what's called "zero key" DCII signals and those are very few and far between. Most of the so-called FTA DCII signals are actually what's called "FP" signals which are actually encrypted but with a fixed key that an authorized DCII reciever will be able to decode. Again for the FP signals the adapter is useless except to see that the signal is actually there and determine it's parameters. Those adapter are available from 2 source and only the adapter from one of those sources will actually tune DCII because the other one doesn't include support for it in it's firmware. Anyway, for the adapter that does tune DCII there are very few signals that are zero key and thus very little DCII it will be useful for.
Another thing to keep in mind is that the tuner module from the dish network reciever is limited to symbol rates of 30Ms/sec or less. That means there are at least a few signals it cannot lock that a twinhan card or DVBworld usb box can. So, with the adapter costing right around $300 and the tuner module costing around $75, if your concerned about getting the best bang for the buck, I'm afraid this 8psk usb adapter isn't it becuase there just aren't enough signals it will be useful for that a regular DVB card will not to justify the extra cost.
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