Happens just as frequently in the UK. Just tends to be a case of IM fob people off.
The 2.5 hasn't been changed much since it first came out, the engine is onto revision 4 or something like that now and the biggest change has been the ridges on the liners to hold them in place. Even the new one is suffering as well.
The standard 2.5 block is reliable up to a limit of about 450bhp due to the boost level required to achieve that, (the higher the boost the more power typicly, so limit the boost, limit the power). People do get away with going to 500 on the standard block, however its a chance and as many seem to fail as survive. The liners on the block arn't that thick, which is what's limiting the boost. Because of that they also have a nasty habit of lightly ovaling the bore when push up the power band, closed decking can help that and 550 is roughly a safe working guide.
Re-liner it and you can go alot higher, but there are costs involved in that and by the time you get to the stage a 2.35 is a strong and more cost effective option.
Also have to think about what the car is intended for, a race car engine for example is a very different kettle of fish to a road car engine. Race cars are hammered, running typically 75%+ of their time on full chat, generating massive heat and pressure. Hence why their cost is alot higher and they dont tend to last that many miles by comparison.
Depending on who you ask as to what's best will get you different answers, but alot of people in the know who have tried various different setups tend to agree the following as a rough guide for most drivable road used engine,
up to 450 then 2.5
up to 550 then closed decked 2.5
above 550 then 2.35
bearing in mind once you hit even 450 then you can rarley use it on the road to its full potential anuyway