The only difference from the original AK is that there is not a ball sensor. The ball sensor senses a ball in the feed tube, and does not spin the feed (reminds me of a weed whacker). This hopper will doe just fine on any marker, except acceptionally fast shooting markers, such as a highly modded Impulse, or an Angel perhaps. The Rhino feeds perfectly into my 2003 autococker. Simple use, too. Pop in a 9-volt battery, press the push-button, and you're ready to play. For the price, you can't go wrong. Although if you have the extra $15 or so, get the normal AK with the sensor.
If you have enough money, get the AK, or even the 2k. Ricochets are great hoppers. The rhino is a fine addition to their line of products, especially for the low budget paintballer. The 2k would rate as a 10, the AK as a 9, so i give this an 8.