Is it great = yes
is it overkill for a recreational diver = YES
The petrel is a great computer. Just like a Ferrari is a great sports car. If you are just a recreational diver, you can find lots of other computers that will fit your needs for way less money. Ebay has lots of used computers in the $200 and under range. You should be able to buy new for less than $300.
But (like a Ferrari) if you can afford it, then go ahead and enjoy.
P.s. send me your old aladin....
The difference is, the ferrari is a peice of crap that breaks down constantly and is known for very poor support. Yes, the Petrel will do EVERYTHING, even if you don't need it. But when you do need it 5 years from now, 2 years from now, whatever, it'll be there.
A laptop will be outdated in 5 months. The 3 year old predator I have is just as current as any computer. And the Shearwater Pursuits people have been using for 10 years still work (and are supported) flawlessly.
If you can afford it, buy it. You won't be sorry.