The organisation I work for has supplied systems for military vehicles for several decades, both tracked and wheeled, and currently has equipment fitted in vehicles (from MBT's to 4x4's) in service all over the world - including the Patria AMV.
As such, I can tell you that the Polish trials showed that the AMV was by far the superior platform - no matter how vertical the sides of the hull may seem! What you can see on the exterior is not necessarily the actual shape of that which is underneath - if you look at a Bradley with its 'skin' on it also appears somewhat slab-sided, something which can be said for many vehicles. The AMV is designed to fill the gap between wheeled APC's (LAV, Piranah, Pandur) and tracked IFV's (Bradley, M113, BMP), and its protection level is designed to suit such a requirement.
It has been stated that "lightly armoured wheeled vehicles are.....usually automotively unreliable" - let me assure you that, compared to tracked vehicles, they are as reliable as the best Japanese automobile! Tracked vehicles are by their very nature much more complicated beasts (and I use that word advisedly), and the less that is said about the shock and vibration levels due to the tracks the better - reliability is not one of their strong points. On top of this they are expensive to buy, expensive to run, need specialist training for the crews, require specialist tradesmen to maintain and are difficult to get to the battlefront. As far as an MBT is concerned, having fired its weapon the only course of action available is to run away FAST, as everybody knows about you and is after your blood. It is also a good idea to run away backwards, keeping the front of your vehicle to the enemy, as the armour protection level at the rear of most MBT's is not much better than that on the wheeled APC!
By using proven automotive components for the powerpack and drivetrain, allied to suitably 'modified' and 'enhanced' equipments, vehicles such as the AMV provide a package that can be operated by just about anyone that can drive a car, serviced by anyone with truck experience, are a reasonable price to purchase, are cost effective to operate and can be transported to the battlezone quickly - the AMV is C130 capable. Patria are now, I believe, the largest supplier of this class of armoured wheeled vehicle in Europe - a position not achieved by not providing what the customer wants, and continuing to do so day after day.
As I understand it, AMV stands for Advanced Modular Vehicle, and its modules will include: Troop Carrier, Infantry Fighting Vehicle, Command Vehicle, Ambulance, Engineering Vehicle, Recce Vehicle, Mortar Carrier etc, etc, and it will be supplied to the Polish M.o.D. in both 8x8 (the majority) and 6x6 versions - so much for the modularity of the LAV!
MBT's and tracked IFV's have their place, but vehicles such as the Piranah, LAV, Pandur and now the AMV are the backbone of any modern army.
My general apologies for the ranting nature of this post, however I felt it necessary to point out a few facts, and congratulate the Finns on producing the best vehicle in its class, and the Poles on their choice.