I just LOVE my Vitamix blender!  I have had it for over 10 years.  I bought the Personal Cup Adapter about 6 months ago.  I do not like it!  It does not mix the ingredients like the regular container.  I have to screw the cup to the adapter tightly so it doesn't leak and then I have a hard time getting it off!  A big pain!  Save yourself a lot of aggravation and get the regular containers.  They are a snap to clean and everything mixes up quite nicely!