Here's an in depth discussion on pinpointers:
https://www.prospectingaustralia.com/forum/viewtopic.php?id=8906&p=1
I have had a few issues with my Whites TRX as of late, with it failing to register after the startup ground balance. Not sure what the issue is, though it did perform well in previous months. Other downsides include poor LED lighting, and the audio isn't exactly loud. The current price hike also has me looking at other alternatives.
My Deteknix X-Pointer is still working fine, though the quality of the plastics isn't quite up there with other offerings on the market, and it can interfere with certain detectors being a PI unit. Other than that, it performs well on my local volcanic soils with no falsing, and the audio and LED are top notch. The lack of waterproofing may also be a concern if using it down at the beach.
The interference can be negated via a noise cancel on the Minelab detectors, or frequency shift on other detectors may help out. Generally if you keep the detector coil away from the pinpointer when recovering targets, the interference will be kept to a minimum.
My trusty Pro-find 25 is still going stong, though it doesn't see eye to eye with highly mineralised soils, needing a fair drop in sensitivity to prevent falsing. Lack of waterproofing and ratcheting feature is starting to make it look old considering other current offerings.
Other pinpointers that I have been contemplating lately include the Garrett AT Propointer (a bit pricey), Deteknix Wader, and the Nokta Pointer.
Maybe Ramjet can chime in regarding the AT Propointer, and Rocket with regards to the Deteknix Wader.