My only cubing goal last year was to get a sub-10 OH single. I previously mained the CH MoYu Weilong WR M Maglev (10.79 PB, sub-20 ao1000), but found it too large and heavy. So I switched to the Mini M Pro and have in ~4 months (with no new algorithms or technique change) managed a sub-17 ao1000 and a 7.64 PB single. Below you'll find a summary of the strengths and weaknesses of the Mini M Pro in terms of OH performance.
Strengths:
- Corner-core magnets provide additional stability necessary for my OH turning style (CFOP, no table-abuse)
- Lightweight, allowing for longer sessions and higher max TPS
- Small, allowing for easier and more reliable execution of fingertricks
Weaknesses:
- Occasionally, the center pieces will rotate to an unstable position (pictured below) mid-solve, necessitating a pause and thus a worse time
- Slightly more prone to pops than previous OH mains
- Expensive, yet won't actually make much of a difference in terms of OH performance until sub-30 ish