I've had my Record Doctor for...maybe 2 years now? I've made replacement lips out of the fuzz side of adhesive velcro strips. I use it frequently, and keep it next to my turntable. The main issue with the unit is overheating, which is warned against in the instructions. This is not a RCM to sit down and clean 100 records continuously with the motor running the whole time. I do mine as needed, a record at a time, and even when doing multiple records it gets shut off for a bit between records.
Here's my method, using homebrew RCM fluid:
1. Get a good paint pad to use instead of the supplied applicator.
2. Place record on platter.
3. Squirt a loop of fluid around the record from a small squirt bottle
4. Spread fluid evenly using paint pad.
5. Using short scrubby motions with the grooves, scrub in a back and forth manner for at least one revolution of the record.
6. Flip record, repeat steps 3 - 5
7. Turn on vacuum motor, turn record manually two turns slowly. Leave vac running, flip record, clean other side 2 turns slowly.
8. Turn off motor.
9. Remove and play (or put back in sleeve).