I have one of the Uniprobes that is the headset ones and it is AWESOME as it has great depth and comes with a high quailty headphones too for a little more than what the hand held one cost. I think it is around $30 more and well worth it plus I don't know if you know a coil and a shaft can be added so you can use it as a detector too.
I like my Sun Ray probes if one is made for the detector i want to keep, but some of the detectors I try out and Field test I use my UniProbe as it will work with them all. Another nice feature is the cord for the headphones that goes to the detector is replaceable, so if you get a bad connection or break a cord you can put on a new one. I keep a extra replaceable cord in case, but haven't had to use it in the 3 years i have had mine.
The things I don't like about the one I have and has been changed on the new ones is mine I bump the switch and turns on and I don't know it until I go to use it and the battery is dead. The new ones they made the switch so instead of going up and down it goes front to back which also helps to know which toggle to switch when when you want to turn on the probe and which one for stereo and mono switch. Another thing is the extra cord for the probe as it will tangle with the ones for the detector at times, but not a real big problem.
Expensive, yes!! but it is actually a detector built into a great set of high quality headphones, so for the money is is reasonable for what it can do. If mine got lost or stolen I wouldn't have second thought and have a new one on its way the same day.
I sent mine in last fall as I developed a short in the lead for the probe and had it check out while there and got it back no charge for the repair, so I am ready to go when the snow melts.
Rick