I'm trying to get into 3x3 OH too. To be honest, even though the YJ mini is a decent speed cube, it doesn't really work well for me for OH. I think the M slices of the YJ mini are just too thin for me. The GAN mini M pro 3x3 is 53mm, but actually it has M slices as thick as on the GAN 11 M pro. That's why I have just ordered a GAN mini M pro few days ago. Also note that the frosted version of the GAN mini M pro isn't as grippy as the semi-frosted plastic on the GAN pyraminx and the GAN skewb. The frosted plastic on the GAN mini M pro is more like the frosted plastic on the GAN 251 M pro, which are slippery before breaking in. For the GAN 251 M pro, I found it just grippy enough after breaking in. However, I just don't think it is a good idea to do OH breaking in on a frosted GAN mini M pro. Hence, I actually ordered the UV coated version for the GAN mini M pro considering that grip would become much more important when it comes to OH. It will be my very first GAN 3x3 and first GAN UV coated puzzle.