Please bear in mind I use Delkims by choice, I am not paid to say this! I have tried and used all manner of alternative bite alarms and once I got used to them and made it my business to mentally adjust to the infinite options on tuning for various situations I may encounter I found to my delight that I could use the Delkims to act as an early warning system when fish are in my swim, consequently I know when to sit on my hands and keep the swim undisturbed to await action.
Alternatively should fish give bleeps and occasional liners followed by inactivity I know that I have probably been "done" so I know to check rigs and re bait for another crack! I have no hesitation in saying the Delkims have without doubt caught me fish I would have missed without them! I unreservedly recommend them.