Regarding SLP lows: much lighter than my CP tournament lows. Shape is nice, there is a tongue detail I didn't notice online - there's a thinner back piece that extends beyond the main tongue (not really sure if functionally it makes the shoe more comfortable, but it's there). Also, there's only a eyelet on the last lace hole. The toebox is more rounded than that of my tournament lows. I don't own any Achilles, so I can't help with questions related to those. While I haven't purposely abused my CP's, I'm perfectly happy with both their comfort and durability thus far. Ultimately, I'm guessing that my MMM will still be the most comfortable. Haven't worn the SLP out yet, but there's some first impressions. Went with the same size.