Dick, I have two PC890 routers in two tables. With my first I bought the above table adjuster which worked well for a very short amount of time and then it began binding causing the router to actually tilt slightly away from the side with the threaded track for adjusting. As everyone else has mentioned there is some slop that occurs and the bit moves but the tilt is the more critical thing.
I kept taking the router out of the base and cleaning it up to make sure it could move easily through the base and I adjusted the clamping tension both tighter and looser to see if I could get it to pull the router straight once clamped but had no luck. With nobody else complaining about the problem I thought it was just a quirk with mine. It was very frustrating to have bad cuts because the router was tilted ever so slightly to one side or to have to grab the router and give it a shake to straighten it back up after lifting before clamping down.
I finally gave in and bought a PRL-V2 lift and love it though it is a big expense.
I later added a router table extension wing onto my table saw and picked up andother PC890 kit with both the fixed and plunge bases thinking maybe the new router or the new base would make the difference for the above table adjustment but I quickly ran into the same problems with that one as well. Now I just adjust it from under the table since it is so easy to reach anyway but some day if I end up using both routers enough to justify it I will buy another lift for the extension wing router.
You do not need a lift but it sure does help with quick setup and precision and a hobby that does not cause stress and frustration is a lot more enjoyable.