I've got the 925, and the 675 and both monoblock px tail sizes, I'm 100kg. I love the crest, great in the surf and forgiving for improving tacks and gybes on flat water for progression.
For comparison having ridden the range.. the duotone glide is faster and slightly better glide, whiz was looser, blitz is fastest, carve turns better and has control at speed , for a weekened warrior the crest is fun and easy to ride...
Here's a HD video riding 925 with 145 mb tail, I've been riding almost 2 years , in my 40's so just riding for my fun, no redbull tricks, you can see the crest makes tacks and gybes so easy.. also other vids on my youtube channel of surf etc. on crest and other foils.