These are really fun, and I've been using one since the early 90s. I started with the old school Digitech PDS 1002 (still have it) and I have one of the original Lexicon rackmount Jammans. Nowadays, of course, the simple small pedals with SD cards have crazy mad capabilities.
Note that there is a marked difference today between digital delay pedals and the looper pedals--each with their advantages. I've messed around with the namesake of my dinosaur the Jamman pedal, which is more of a looping pedal. I've also played with a friend's Line6 DL4 which is more a modeling pedal. It models different kinds of delays, such as digital and analog types. It was pretty cool. If you're looking to loop and layer tracks and sounds, check in to looping pedal, since they have useful features geared more towards tracking, recording, and uploading to your computer. I've only tried a Boss 20XL, and it was quite easy and intuitive to use quickly.
These pedals do way more than I can throw at them, and I can mess with one for months.
Start by choosing a delay vs a looper. You may want to just read up on a grand list of what they can do, choose which features you want, and narrow down from there. It's dizzying how much there is on the market today.
Don't know if that's much help, but I hope you get some insight. Have fun!
