As a daily user of the XTS3000 and XTS2500 for work my take away is this, the Unication pager is a pager. You clip it to your belt and wear it all day. It is small, inconspicuous, can be tucked under a shirt. It has tone and vibrate alert. The XTS radios are large, very conspicuous, you're not walking into the grocery store with an XTS3000 on your belt or in your back pocket. The XTS does not alert you to calls. They are not interchangeable. I have used the G1 and it is loud, but not nearly as loud as my XTS 3000 or XTS 2500. But I rarely if ever to I keep them cranked up.