I have the Extend-A-Sand, and I probably wouldn't buy one, if I'd had the experience of using it prior to owning it. It's a well made contraption, for sure. It does work very well for it's intended purpose.
Other turners who have a need to sand down deep into vessels may have a use for it.
I've been one who has tried out a lot of different products that I've never used very much. From my perspective, the money spent led to an expensive conclusion......but, that conclusion is based on experience, rather than speculation or theory. Actually, I have quite a few gadgets that were only briefly tested.......someday, I'll probably end up selling them.
I also use the inexpensive drill bit extensions, and actually use them quite a bit. These are more applicable to my needs, but don't have the "reach" that the EAS has. I can see where some other turners, the EAS will be the best option, but most of us will find the drill bit extensions a good way to go. I have made hand holds for the shafts.......once you do this, you'll never go back to holding with bare hands........😉
ooc