I want to add my 1010 experience to the discussion. I’m on my 10th pair and it has been my favorite shoe and go to in the last couple years.
In my experience, heel-slip might occur and depends on the materials a little bit. But it always went away and was part of the break in process. To make this as smooth and painless as possible, I developed a little routine. I always wear them walking around for a couple days at first and while doing that, I lace them really tight and all the way up, making sure the heel is locked tight into the shoe. As soon as they contort with my foot a little bit better I start skating them and don’t use the top lace holes anymore.
Further things I noticed: there has been some kind of upgrade as it has been discussed here before.
The “Updated ones” feel a little bit tighter around the forefoot. In most cases, the heel cushions are a little bit more puffy and the most noticeable hint to the upgrade are the lace loops second from the top. The old ones had a metal ring that broke the laces pretty quick and the “Updated ones” feature a rubber lace loop where the laces are protected a little bit better.
I think it’s really cool they updated the shoe and made it a little bit better in my opinion. Nice attention to detail.
To summarize: Stiffer materials, especially leather and a non-mesh toe cap might cause a little more heel-slip and may require a longer break in period. Also, the old ones had this a little bit more. The brown suede ones (called the broccoli and beef colorway) definitely are the pre-upgrade. They had a second round of those after the upgraded ones came out, but the brown ones still were the old construction with the old lace loops. Also, you might want to check how puffy those heel cushions are filled. I’ve had a couple models where there seemed to be less filler material inside.