Vacuum pump - Dr Walsh disagrees

There are two recommendations often made around here.
One is Dr Patrick Walsh's Guide to Surviving Prostate Cancer.
The other is the benefits of trying a vacuum pump to aid recovery.

But Dr Walsh say: "... Also, because this approach does not bring new blood flow into the penis (huh? Isn't that exactly what it's for?), it may not do much to facilitate the recovery process. Some men are highly satisfied with the result of vacuum devices; the majority are not."

That's not what everyone around here says.