So I replaced the driver's door over a year ago. The passenger more recently. Now the drive door is acting up again. Just like Chops mentions, when hot out it doesn't work. When colder it tends to work.
Had I mailed back my "core" to the eBay seller that I purchased both actuators from I would have had a lifetime warranty. Whoops. I'll try replacing just the motor this time.
IIRC, it took me about an hour to do the driver's door the first time. 30 minutes for the passenger side. However, I do have to disassemble the actuator itself to replace the motor but $5 < $170.