I had a set of the Launches ('04s?, the older red and black ones) when I first got a set of Mallets. I had to do quite a bit of trimming of the sole around the cleat pocket to get them to engage. And this was even with using 2 spacers under the cleat. Maybe the design of the 661 has chaged over the years. I switched to Adidas Plush shoes at the beginning of last season and I LOVE them!!! The engagement is so much better without any need for trimming on the sole. And I like the lugged sole design - a little grippier for hike-a-bike sections. I've the Plush shoes show up of the feet of a few pro DH riders this season, too.