When on a trip by myself I dive 2 Shearwaters running identical algorithms (Perdix AI, Peregrine) so that if one fails I can still keep diving for the rest of the trip (I've never had either fail yet, however). When diving locally I just use the Perdix AI, as my 2 sons (my dive buddies) are using Peregrines (they each have their own, I use one of theirs for my trips).