Extensive experience of the rMB and used the iPP Smart Keyboard for 3 days prior to returning the whole shebang. Saying they're identical is frankly laughable.
I do believe the Smart Keyboard isn't too bad, if seen as a light(ish) cover with some added, useful functionality. Judged strictly by when you're bashing out letters and numbers on a desk, there are clear similarities.
The similarity ends when you move away from a desk, when the inevitable physical movement of the device on your lap comes into play, when you ponder the absence of the fn key and the F1-F12 keys, the stupidly placed keyboard language button, the lack of palm rest, the " feel" (admittedly hard to quantify and subjective) of the canvas keys both in texture and feedback that remind you that this isn't anything like a keyboard you're used too (good/bad thing dependent on taste). Admittedly an os issue, but the woeful number of shortcuts and the muscle memory that has you feeling for a trackpad like a ghost limb do not a great experience make imo.
As a cover, stand and minimalist desk dock I can see it's plus points, but saying it is identical to the rMB keyboard is, well, moronic. I admit my impressions were formed only from 3 days usage, but I can't see many of its shortcomings being resolved soon, and some of it's shortcomings are unresolvable in its current form.
tldr; handy in a pinch, but severely compromised.