I think the idea is intriguing, but would want to know a few things such as cost.
I believe MSRP is $1150 or so. Street price I think will be around $1100 initially and then drop slightly, maybe in the $900-$1000 range would be my guess. I think prima facie people think, "What?! $1100 for an EFS?" But as we consider how good these recent EFS lenses are optically (60 macro, 1022), and that EFS looks like it's here for a while (1.3x probably about to die), and that the 1755 is IS+f2.8, it becomes a little more feasible.
Also I think I will wait for your review prior to purchasing.
I'll definitely put it up against my 1785 and whatever else I can get a hold of at that time.
As far as the converted lens, isn't it more flexible converted? I would provide it converted with the option to convert it back. That way you can please both crowds.
I would think so myself, and state precisely what's been done and that I'd be willing to convert it back or whatever if wanted, even after the purchase. I would think 10D/D60/D30 owners would at least consider it. Thanks for the input, Doc.