I have the 98QE and I use the 4" pantogram so far I haven't had any problems except getting myself into a good rythm (which comes with practice) and I done 3 queen size and 4 crib size.
Its isn't as great as having an HQ16 but who has thousands of dollars to spend on 1 machine unless you are intending to do this as a main source of income. I'm happy with my 9" throat works for me.