I bought this to "upgrade" from a Select controller.
This device - like its little brother the Select suffers the problem of putting too many features behind too few buttons and too small a display. You don't for example even get a permanent display of which two locos you're controlling.
There's inevitable menus to scroll up and down and not very intuitive way - certainly I didn't think so in my short acquaintance with it (silly stuff like naming locos for example you have to scroll through a bunch of punctuation and the numbers before you get the letters. Scroll the wrong way and you get even more bizarre characters).
I'm not sure I like the "clicky" rotary controls, they really don't feel nice - there's no end stop or line and whilst there's a low-contrast display of throttle (or regulator!) you only get this for the selected side not both.
It threw a couple of randomly numbered errors whilst I was using it - though this may have been related to a dodgy power connector on the back which doesn't work at certain angles - so I'm returning it hoping to not see one again.
If it's independent control of two locos you're after and you've a Select already then maybe adding a Select Walkabout is the better idea and a third of the price.