Bought these early in the season, after my Nikes physically blew apart. They are great, feel really light, very quiet and get me up and forward through the hips. Being older (40+) this is important.
Having the shroud provides a level of security also.
I have a very wide foot with a narrow heel, and the versatile lacing options catered perfectly.
I use them for 60m through to 400m, and LJ.
In LJ they felt like being in bare feet, and I'm not sure if it was my time or the shoes, but I started jumping consistently 30cm further.  For 400m they keep me up on my toes for the full lap, (not easy at my age).