Think they’d be fine & worth a shot. I know folks who have had success with them.Thoughts on cone-tainers (not just regular containers, the narrow tubes w/ holes on the bottom) vs rootmakers? Seems like root makers are more popular on IW, but you see a lot of the cone-tainers which seem appealing to fit more trees in smaller space and seem like they'd make a good tap root. Although the rootmakers seem like they create a more dense but shallower root system. That is all just thoughts as I'm only trying rootmakers for the 1st time now.
I run rootmakers & graduate to gallon pots. Plant a “gazillion” & space isn’t a huge issue. Spose it would be if you got into the thousands.