Upload & Sell: Off
I've used the Markins Q20 for 4-5 years, getting it wet and also exposing it to the harshest desert conditions (wind and sand). I wipe off the sand after trips and put some more oil on it a couple times a year. It is still VERY smooth and working great. The biggest gear I've used is the 300/2.8 and a DS1 mark 3. It handles that load without a problem.
I cannot speak for the alternative: no experience.