Some guys on here are big fans of the Sun Ray probe on their Sovereigns and swear by them. It's a fine product and gets really good depth. I'm just not a inline probe guy and prefer the less weight/bulk of the Pro Pointer. I had the inline probe on my Explorers and didn't care for the extra shaft weight or mess from extra cable wires. I also found it a hassle to need to use two hands to remove/replace the probe on the shaft easily, and would end up getting the detector rather muddy from that on wet days. I also can't tell you how many times I forgot to flip the switch back and would go for minutes hunting without noticing.
With the Pro Pointer I can use it left handed while still holding my digger in my right hand. I can remove it from it's holster on my hip, turn it on, super tune it if I need to (using my thumb), located the target, turn it off, and put it back in it's holster all using my left hand only. That's a big perk to me.
One big perk to the Sun Ray is you hear the target through your headphones. That's really nice, as I like to slide an ear muff off to the side a little with my Pro Pointer so I can hear the audio better, as I like to hear the audio and feel the vibration to find targets. Not having to do that with the Sun Ray is a perk for sure.
Another perk for some is the Sun Ray will discriminate targets through your machine. Some of my fondest memories of hunting with my Explorers were waving that Sun Ray probe into the hole and seeing a potential silver coin ID on the screen and hearing a good flutey silver tone in my heaphones. That I liked for sure. But, on the other hand, I prefer not to discriminate out targets with my probe once I'm bending down and commited to digging whatever it is out of the hole. I don't want to leave any metal, even iron, in the hole to have to hear next time I hunt the site. Besides, there could be a coin behind the junk. If you thought you had a silver signal when detecting anyway are you going to stop looking for it when you dig the hole and the first thing your pin pointer sees is junk? Not me. Of course you can flip the detector to PP mode and not have the Sun Ray discriminate, so that's another perk for it.
The Pro Pointer has really good depth, and on the rare occassions I can't hear the target I just super tune it and the depth about doubles or more maybe. Saves me from getting up to re-pinpoint the target with the detector. The biggest thing I like about the Pro Pointer is no cables and not attached to my machine, as I want my GT land shaft as light as possible and clean of as much clutter as possible.
Another big perk is you can lay your machine down and still go over to help a friend locate a target he's digging with your Pro Pointer. Sometimes too if there is a lot of noise around I can't hear the Pro Pointer as well so it's nice to have the vibration to help guide me.
The Pro Pointer gets about close to a year for me in battery life, so I don't mind it needing it's own battery, but the Sunray has that advantage of not worrying that your pin pointer battery is going to go bad.
Another perk to the Pro Pointer is you can use it with other machines, and hold on to it if you sell a machine and buy another.
Those are about all the pros and cons for me anyway to both. Some swear by the Sun Ray and for good reason. Some swear by the Pro Pointer and have their reasons too. The choice is yours as to which way you go...