that's what I thought about a few analog & digital delay pedals, but I'm selling them all now.
I've sold most of mine, but there are a few that I've found reasons to hold onto. I don't use them in conjunction with the Axe-FX typically, but they still see service in other rigs. I've found that I like to keep a small amp rig set up at home for when something strikes me and I also like to have a small to medium amp rig that can travel for grab-and-go gigs or jams.
I've thought about selling my M13 a few times, but I just can't let go of it. It's too useful for too many things. I have used it along with the Axe-FX for a few gigs where I needed to get effects heavy or where I needed some crazy sound that I had created in the M13 that I didn't want to spend the time recreating in the Axe-FX.
For those that are say the Axe delays are better, what does that really mean? I see delays as different, and certainly some are better for one thing than another, but to say that the delays in the Axe are better than the ones in the M series doesn't make any sense to me. They're just different. Sure, the Axe is vastly more customizable, but that can be as much of a curse as a blessing. When I want to dial in this perfect delay that I hear in my head just the way I want it, I grab the Axe-FX. When I want to quickly go through a bunch of delay sounds looking for something that inspires me or fits what I'm looking for, I grab the M13.
To the OP, if you don't need to sell it for financial reasons, keep it for a good long while. You may find that it's really more useful for some things than you thought it would be. You might want a B rig, a backup rig, a small amp rig, you may need some weird little sound in it for one tune at a gig, etc.
D