RE: Do I need The Dim Pro Updates?
With respect to DPro the term "high sampling rates" doesn't mean what people think it means.
"High sampling rates" for DPro and Dimension LE means anything above 44,100 samples/sec. While it is true that the pitch bend problem did not, as far as I recall, exist for 48,000 samples/sec the distortion problem DID exist for anything other than 44,100 samples/sec for version 1.2 of DPro and for LE. This distortion was not as audible for 48,000 but was definitely there.
If you're using 44,100 samples/sec you should be OK. If not, you should consider getting the hotfix or whatever it is that finally shows up that solves the "high sampling rate" problem, unless you like the aliasing-like distortion.