Here’s what I’ve come across in my hours of research.
Electro Harmonix 45000 and 95000 are both awesome options, but major negative is that your first loop dictates how long all the other loops will be.
Boss RC505
Not a pedal, but insanely popular especially with the beat box community, but perhaps it’s little too much? Also the housing feels a bit…eh.
Pigtronix Infinity
Great little looper pedal offering a lot of under the hood options. A true guitarist looper pedal. Only two channels though.
Boomerang Looper
Has a cult like, fanatical following. Be warned that they will hunt you down if you say anything negative about this massive unit of a looper. Lots of options, and a solid performer, but it’s pretty big.
Singular Sounds Aero Looper
This looks to be the Cadillac of looper pedals. No doubt you’ve seen it mentioned or already watched loopop’s video. Pricey.
Beebo/Digit
A new firmware has been released that includes a beta version of their looper. Sounds ambitious, and along with all the other offerings on hand, can no doubt get cray cray. Downside may be that it’s not a “dedicated” looper pedal, and you’ll have to tinker with it.
Those were the ones that I especially focused on, and which offer your midi requirement and can do the pre-set length thing.