A 5 year warranty means if it breaks inside 5 years it'll be replaced free of charge. No-one can manufacture a complex product and say with 100% certainty that it will not break.
They're unlikely to break often - consider how much it would cost the manufacturer to replace a $600 drive every 2 weeks for 5 years? So yes a 5 year warranty is a good guide that it's generally a reliable and lasting product.
As for the data unless you've got a backup I'm afraid you may be out of luck. 
If you've only had the drive for 2 weeks don't you still have the data on your old drive? And I appreciate no-one likes hearing this after their drive has just failed but take regular backups. No matter how much they cost - disk drives sometimes fail.
I don't know if you realise this when asking if I have experienced such issues but I don't have any affiliation with Crucial. My name is only in a different shade of blue because I spend too much time on this forum. 
So I can only provide you my own experiences and not an official point of view. Which is this - I'm not aware of any storage manufacturing company that guarantees against data loss. If your mechanical drive failed and you wanted to recover the data then you'd need to send it to a data recovery specialist at a cost of a few hundred pounds but I would imagine (and I don't know this for sure) that SSD technology is too new for most such companies to have recovery techniques for SSD's.
They are reckoned to be more reliable than hard drives and I've not seen many occurrences of drive failure on this or other ssd forums but sometimes it does happen and you should ensure you have recent backups in case the statistically unlikely worst case happens again.
