I use them all the time… i have about 5 of them for transporting wood chips, or potting soil… i have two that i use as watering stations… im only on year 2 of them but so far they are the best muck tubs that i have had. They are nice and strong.
However if you want pots to grow in im not sure how many years you could get before UV gets them… Im leaving them outside to see… 5 years would be worth it to me.
These would be a better long term solution… i think. They are sold at various vendors on the innerwebs.