My view/opinion of 5x5....
The idea is nonsense,
Firstly, the idea is arbitrary, there's nothing scientific about a "method" the advocates performing a certain number of sets and reps just because two numbers match, this also goes for Vince Gironda's 6x6, 8x8 and 10x10.
Secondly, the movements that are typical advocated along with such a training "method", require the right/ideal bodytype, ever noticed how the best gymnasts are quite short or how top level basket ball players are very tall? The same is true for certain exercises/events, as Mark Ripptoe even said, "not everyone is designed to be a good Deadlifter or Squatter". Its no wonder squats and deadlifts have f**ked up more trainees backs than they have built powerful physique's! (Yes, poor form plays a big part with individuals getting injured , but so does not having the right bodytype for certain exercises/events).
Thirdly, low reps on big compound movements (on every workout) is a very high stress way to train, the connective tissues are put under a great deal of stress, as is the CNS, if an individual is going to train in such a fashion, then they MUST learn to manage the stress, as ML pointed out above, deload weeks are a great way to help manage the stress, you can also reduce the volume and/or frequency as well, either way, if you dont manage the stress, you will soon see your progress come to a grinding halt!
Fourthly, the flat bench press is a very dangerous exercise/event, not just from safety perspective, but also from a bio-mechanical stand point, in puts an inordinate amount of stress on the pec/ shoulder tendon, DY explains at the start of this video... http://www.youtube.com/watch?v=SuFklvQX2KY
If its strength your after, then i'd recommend a combination of Mike Mentzers HD 2 routine, alternated with his Consolidation Routine, the HD 2 rouitne is low stress high intensity training, and the latter is high stress high intensity training.