Personally I love them, had a set for years but swapped about a year ago to Gardner att silent alarms that only work with a receiver.
I don't like them, don't like the rollers, the batteries are a pain in the ass to source from a shop, you have to order them online, you also have to unscrew 4 screws to get the back off to replace the battery.
The receiver, well I didn't know how to turn off the vibrate setting and would nearly give me a hear attack when I'd get a run in the night π€£
I've also missed the roller before and had the line sitting on top of it which didn't spin on the take, luckily I heard the clutch/drag lol.
I believe I had a pair of fox warrior alarms as my first set which are still kept in the shed as a set if I take a friend with me. Still going strong just the led has stopped working on one of them so just need to make sure you are striking the right rod π«£π€£
In my honest opinion delkims suit me best and will be going back to them when funds are available π