Is the Altra Mont Blanc Carbon ideal for a slow runner? First run

I cannot call myself a fast runner. I rarely participate in short runs, but that does not mean that I do not need to do fast runs!
Today, I had a fast session on the trails, and it was the perfect session for the Mont Blanc Carbon. The session included a 1km walk, a 1km easy run, and 3* (1km all-out uphill, all-out downhill, and all-out for 1km on a flattish trail). The average pace for the 1km uphill was 8 min/km, for the 1km downhill, 4:28 min/km, and around 5 min/km on the flat trail.
The ride was not aggressive, and it handled all paces well. Of course, this is the first run, so things might change a bit, but I have enjoyed running in this shoe so far. The plan is to run an ultra in it this summer! I won't run fast, but I can test the comfort!