I'd go with either the Petrel or a Liquivision.
---------- Post added September 17th, 2013 at 06:23 PM ----------
Why? I'm a new Liquivision owner so I'd just like to know what you like so much better. You can PM me if you don't want to post here.
---------- Post added September 17th, 2013 at 06:27 PM ----------
I love my XEO, partly because I wanted a big, easy to read bright screen.
The comments below are my opinion as to why the Petrel is better than the Liquivision XEO and the issues I had
1. The start up screen txt is green and is the only screen you cannot change the colour of the txt (if you can I couldn't find a way). I wear glasses and without them I don't have a hope in hell of reading it to see what to do next once the start up screen runs. I set all of the txt colours I could to bright yellow but this drains the battery quickly. The txt on the Liquivision XEO appears smaller (from memory) compared to Petrel which adds to the difficulty of reading it particularly in sunlight. The Petrel has white txt on black and very easy to read in sunlight or the water.
2. The Petrel screen is bigger and very clear for me to use even without glasses and 100% better over the Liquivision XEO by direct comparison. Before I sold it I used both and found the Petrel to be heaps better. Others commented that under water they can easily read the Petrel display as well on my wrist, this was not so with the Liquivision XEO.
3. I didn't like the tap tap approach of the Liquivision XEO either and had some problems getting it to go some days. I also have noticed others who own them and have had similar issues. I watch how people use their gear without comment and see what they can use simply and what they appear to have difficulty with. Sometimes I ask what they think of their gear out of curiosity to see what they think as my opinion is only my opinion after all.
4. The Petrel Bluetooth is easy to use and works great. Better than the IR approach of the Liquivision XEO which I did find could be sometimes hit and miss.
5. Petrel will take any battery so you never get caught out anywhere. I love that I can have rechargeable, lithium or alkaline as one can usually get one of these battery types at a pinch no matter where you are. The Liquivision XEO battery is more limiting regarding batteries.
6. The Petrel is cheaper to buy ($1000 AUD with the extra algorithm (using alkaline batteries and built in bluetooth), compared to about $1350 for the Liquivision kit which you need for the charger and IR interface)
7. The Petrel allows you to change algorithms which is what I also wanted and the cost was not a lot ($75). From memory you also can with the Liquivision but the cost is significant (about $150 or so I think for the upgrade).
I am not just saying this because I now have a Petrel, I bought the Liquivision XEO first (second hand from another owner who only had it for a little while for about $800), and quickly became unhappy with it, so I then bought a Petrel on recommendation of a LDS who sells both and gave the Liquivision XEO to my wife. After we used both for about 20 dives, I then sold the Liquivision XEO at a small loss ($700) and bought another Petrel for her. We are both very very happy with that decision.
I know this is only my opinion but its based on using both computers, not just using one and being happy with it, or self justifying a purchase. I am really really happy. The only up side I saw for the Liquivision over the Petrel is that its physically smaller and sits better on the wrist than the Petrel which looks a bit like a brick. However all the other things make up for the size so I would recommend a Petrel over a Liquivision XEO anytime.