VOL IV vs VOL II TS: what's the difference?
Could someone explain the difference between the vol 4 product (10 TS labs) and the vol2 TS labs (6 and counting).
Is there a difference in difficulty? I presume both sets resemble the actual TS section.
Does the vol4 product have its own roadmap (last update was back in March/May) or is it being
superceded/subsumed under vol2? Tks.