I have mixed opinions on this bt here it goes. All computers are basically the same. the differences lies in the display and the controls. I have had now 4 computers and the first 3 were basically useless to me cause i needed a book everytime i used them. the display was ok,small but ok, but to do a gas change i had to get the book. lets see is it press 2 buttons on one and it is the right and middle ot the left and middle, ect. If you cant navagate through the computer or your type of diving then you are paying too much. I had a friend talk me into a sherewater preditor. Yes i now its expensive however it is colored display and a big one at that. it has 2 buttons, a scroll function and a button for select function. After the frst time using it i never needed the book again til i upgraded software. No crime in that. So my point it if you are going to spend 6oo for a computer and can use only 10% of it reliably then you payed 90% too much. Now if you spent a thousand and you can use 90% of it then you only overspent by 10%. If you,,, over the next few years upgrade to other cmputers then you WILL have well over 1000$ by the time you THINK you are done. I dont think i will ever upgrade from my preditor. The petral is a good choice also. Its only drawback is that the display is light sensitive. That is under your control.
Regards