GUI appearance vs operability
The Bakers put great emphasis on the improvements to the GUI that came with the X-series and beyond. It's a pity that the same rigour is not being applied to the latest plugs, where flashiness is more important than operability. The new LP MB lacks an easily accessible overall level control and has no overall input level control at all. Its predecessor had both in a clear and logical place. In LP-64 Multiband, any band could be soloed or disabled with one click. That is not possible in LP MB - you have to select each band before you can disable it or solo it ... and why does a headphone graphic indicate solo, when everywhere else in Sonar a green S is used?
LP EQ does not have labels on the plot. It was useful to see frequencies, gains and Qs displayed on LP-64 Eq, simply because the numbers may stay in your head "for next time", whereas a dynamically re-scaled curve carries little meaning.
And while I'm here, I'll have a little swipe at TH3. The "boxes on the floor" metaphor may be an improvement over the TH2 "accountant's spreadsheet" - certainly, IK Multimedia and Line 6 agree. However, TH3 boasts that it is compatible with TH2 presets, but provides no bulk import. The only way that I have found to import is a tedious and confusing bank-at-a-time, where you can't even see what you are importing until after you have done it.
All of this new technology may well be excellent (i haven't found out yet) but the weaknesses of the GUIs devalues them. It shouldn't be a trade-off.