I am currently doing due dilegence for a pending trimix computer purchase. Any comments on Sheawater vs. Liquidvision?
I think they are both top notch trimix computers. I'd say the most important question is which deco algorithm do you prefer? I believe these are the options:
X1 = VPM-B, VPM-B/E, VPM-B/FBO, ZHL-GF
Predator = Bühlmann ZHL-16C
As I mentioned previously, I think being able to plan your dives (and cut your backup tables) directly from the X1 can be a big plus. I also like the fact that I can plan my dives on my laptop with V-Planner and match it exactly with my dive computer. If you don't use V-Planner that obviously would not be a plus. Also, as it stands, you cannot plan GF in V-Planner, but that may change in the future.
I've heard a number of Predator owners say how they like the size of its screen better, and that if there are any issues, the color turns from green to red. I personally like the smaller size of the X1 and don't need any color changes to get my attention.
Power may also be of interest to some. I like the rechargeable battery in the X1 and I've gotten excellent burn times between charges. The down side is if you loose the charger, or leave on a extended vacation without it, you may be forced to purchase another one or have someone send the original, if possible. The X1 does come with an assortment of plug converters for international travel.