I have no experience of them myself but I’m throwing in a link to @Blonde_Bunny 's review of one.
The “liquid” taste and texture depends on what you fill it with, she gives you details on what worked for her.
Warning before reading: If you’re interested in buying a product she has reviewed and liked, her reviews are very influential in making you press buy… I speak from experience with other products! 
And Happy Birthday, hope it’s been a good one! 
