Am not sure whether PA has been designed to replace specialized tools, like the one you mentioned.
Assume PA’s encryption will be sufficient in, by far, most cases. That aside, specialized tools, like Deslock have a different pricetag and may be less ‘userfriendly’.
It is a bit like with ‘wiping’ data: one can use a 1 pass wiping, or follow complex schemes like DoD 5220.22-M, that are taking a century to wipe a 1TB drive.
From what I have read, for the normal ‘day to day work’, a 1 pass wiping is sufficient, making it already extremely difficult (and expensive) to recover ‘wiped data’.
see: http://www.anti-forensics.com/disk-wiping-one-pass-is-enough
=