Well, I'm still building the caad10 mainly due to laziness and work.
On my caad12 I had sisl2 170mm cranks, until my nds pedal stripped. I had a backup hollowgram si 170mm I planned to used on my caad10, that I had to use on my caad12. I just got it back from sending it out to have a 4iiii power meter installed on it.
I've had the entire range of modern hollowgram cranks on my caad12 at this point. Started with the fsa 52/36 and cannondale si 172.5mm cranks, now I have the 52/36 10 arm spidering on it with the 170mm sisl2 DS and 170mm hollowgram Si 4iiii NDS. I had a 53/39 fsa chainring set with hollowgram si 172.5mm on it while I was waiting for the 4iiii to come back. I also have the 10 arm 53/39 but I haven't tried it yet.
The sisl2 arms at least are notorious for cracking, I'm not sure if the sisl arms have the same issue but something to be aware of.
Can you clarify what bike you have and the year?