There not based on Bühlmann decompression algorithm
Suunto is a closed system with there own algorithm or derivative from Bühlmann
It goes in safety modus when you don't follow there safety stops ...
So when you make a big big boo-boo as a scuba diver ... you are really f$`$`$
because Suunto basically say you are on your own from that point, instead of helping you and recalculate your assent to bring you as safe as possible back to the surface.
I'm happy with my Divesoft but wouldn't say no for an Heinrichs Weikamp
(which has open source code I think)