They last for months, and sometimes years.
They play in much quicker, a tip change no longer means sessions of adjusting to the new tip.
They hold chalk better.
They don't splinter as easily.
And they offer a more 'grippy' feel of the cue ball which seems to allow for more spin to be generated.
The tip is the most important part of your cue - it's the only thing permitted to strike the cue ball - so we welcome any improvement!
You can find JP's guide to retipping a snooker cue here.