I wouldn't use my RR without the throttle! PAS might be all you need for road riding, but 90% of my rides thus far have been on trails with some moderate climbs. I find that PAS Level 1 is fine for off-road, but Level 2 is far too powerful IMO (a BIG jump up from Level 1), plus it keeps propelling the bike for a second or two after I stop pedaling. This caused my first wipeout on a bike in years so I've only used Level 1 since... I use the throttle on-demand for steeper climbs - I find it far more controllable and SAFE.
Do you ride off-road in hilly terrain much, or plan to maybe someday? If so, I think you'll find that you miss the throttle...