Any thoughts on the best for an iMac
Well, as
Harry states depends on your intentions and whether you have USB 2 or 3 ports on your Mac - so give us some more details.
USB buses can be 'stand alones' or be 'powered', the latter providing more amperage per port, depending on the USB version (typically USB 2.0, 0.5 Amp vs. USB 3.0, 0.9 Amp); also, the speed varies w/ the type of USB standard chosen, so a number of decisions to make.
I've used non-powered hubs which are fine for low amperage purposes, such as flash memory sticks and printers; external HDs are more difficult - I was doing my Carbon Copy Cloner backups for my iMac on a powered hub w/o a problem - then bought my wife an iMac stand w/ built-in non-powered hub, the external HDs would not consistently work; also, my Apple SuperDrive (optical) seems only to work when plugged directly into the computer's USB port (whether on my iMac or MBPro).
Thus, provide us some information regarding why you want a USB hub, what USB standard(s) you are using, and what devices you need to attach. Dave
