Price really has very little to do with it. If your Calrads work well for you, use them on the X-Terra. If they are comfortable and reproduce sounds that you can interpret, use them. I wear a size 7 3/4 cap, and the Gray Ghosts are one of the few that fit me well enough to hunt for extended periods of time without causing ear discomfort. The padded earcups do a great job of blocking out the "outside" noise. Whether it is kids playing nearby, cars driving by or just the wind, my Gray Ghosts block out most of the ambient sound and let me concentrate on hearing the tones of my detector. The cord has a 90 degree plug that is less likely to get in the way. If you have a straight plug on the headphones you use with the X-Terra, (depending on how far it sticks out) you'll need to be careful not to bump the plug, putting an extreme amount of pressure on the detector electronics. The sound reproduction of the Gray Ghosts is as good as any I have used. Most headphones reproduce a wider range of sounds than the human ear can hear. So don't let the "99" tone thing scare you. Frankly, I'm not convinced there are 99 tones. I figure it there are only 28 notch segments, why would there be more than 28 tones? I've been using my current set of Gray Ghosts for 4 years. About 18 months ago, I noticed the pads around the ear cup had become hardened and weren't as supple as they originally were. I suppose perspiration has something to do with that. I contacted Gary Storm, owner of DetectorPro, and for $10 I had a new set of pads. Just peel off the old ones and press on the new ones. Good as new! JMHO HH Randy