The advantage of the squirters is better control/limiting of peak piston temps under high loads. Many, perhaps most turbo diesels designed to pull at higher % loads continuously have them.
The disadvantage is there seem to be more reports of them cracking, sometimes up into the cylinders. Can't recall if the theory was the cracks start around the additional oil passage drillings, or if the cracks starting from marks/dings possibly caused by whatever machinery was used to drill the additional holes - like a spinning cutter wheel occasionally bumped up against the bottom of a cylinder & dinged it creating a stress riser.
Gotta open it up to check for cracks around the mains anyway. Having 45-50k miles on the engine can possibly be a good thing, in that the block has been thru lots of heating/cooling cycles and is "seasoned". Not that the additional time necessarily makes it stronger/more durable, but engine builders consider them more "stable". The thinking being all the heat cycles have allowed some internal stresses (created when pouring it) ample opportunity to relax.
My thought is more heat cycles/running time means more opportunity for a block that's prone to cracking, to show itself cracked. It's just a theory, but after finding no cracks around the mains in my truck's 157k mile engine, one would hope it's unlikely to ever crack under normal conditions.