I've used the Vibraprobe, Sunray X-1 and the Pistol Probe.
The Sun-Ray is convenient in that it is connected to the detector and can 'target ID'. I find that the depth is ok, about 3". It is very handy and quick for finding surface coins. It does add weight to the detector which makes it more difficult to swing for long periods of time. On occasion, I have forgot to toggle back to the main coil and hunted for a few minutes before I realized my mistake. Took, the X-1 isn't cheap, I think that with an upper rod for my E-trac it is by far the most expensive of those probes that I've had. Lastly, it isn't readily transferable to other brands of detectors for obvious reasons.
My vibraprobe was ok, better than not having a probe but my least favorite of those I've used. Depth wasn't very good, and mine required I tip it upside down to activate. At times, as I was gathering my equipment to put in the car to go hunting, I could hear the vibraprobe repeated turn on and off as it shifted around. It has the least depth capability of these thress which reduced its functionality to use as a surface coin finder.
The Pistol Probe, being a pulse detector, is very good at finding all of the iron and targets in a hole. It is larger that the vibraprobe and hangs from my belt. It wasn't until I started using one that I really came to realize HOW MUCH rusty iron was in the holes with the coins and tokens I was finding with the E-trac. It also gets very good depth as well making it easy to decide if there is something deeper in my hole (for sure) or if it has already been removed. The PP does interfere with my E-trac most of the time requiring me to swing the E-trac coil away from the hole I am probing. I can shift the frequency some which helps some. Not a big deal, but a little inconvenient. And with the PP, I have to lift one of my headphone earcups so that I can hear it. Again, not a big deal, but a little inconvenient. Being that it sits on my hip rather than on the detector help relieve some of the weight I have to swing. And being that it isn't detector dependant, I can use it with any detector that I like. I don't care for the plastic housing and control cover, it feels somewhat cheap.
I've not tried a Garrett Pro Pointer yet. I've heard that the are well made, get close to the same depth as the Sun Ray probes and are handy in size.
Regardless of preferences, I can't imagine hunting without a probe. To me, a hand held probe is a necessity for my type of hunting.
Rich
I use my TM for detecting and gold mining. It does get one inch + on a coin in the ground. The only problem I discovered that if I lay my detector next to my target hole, my probe goes nuts!!!!!!!! I simply move the detector coil away from where I am digging and the problem goes away! 