Yeah, my IR3 and HALO don't go together at all, I've never even been able to use it on the field. You put the HALO on, take about 15 shots, then it skips (like you've outshot the hopper, but hahahahahahahahaha), then it proceeds to break every ball from that point on. On my LCD, it works like magic. I haven't heard of many problems with LCD owners. The Speed and A4 have the LP and dual ball detents, so they're supposed to be pretty much designed for use with the HALO. Don't know, guess it just depends on the model. Word of advice, if buy a HALO and it doesn't work, don't expect much from Odyssey, they told me there's something wrong with my marker, they're not going to refund any of my money, nor exchange it for another one. And since they come out with a new software revision every couple of days, you can't sell your old model for anywhere close to what you bought it for.