I have not tried any of those cases, but thought about the Photive one a few times. The Kensington looks decent, but at the price you may be better off with the Poetic SlimLine.
So far I have tried the following:
Speck FitFolio
Joy Factory Smart Suit
Bear Motion Folio w/origami like cover
Khomo Folio case
RooCase Folio
KayCase smartcover compatible TPU and Shell cases
Nugadget TPU case
YooBao Executive Leather case
Incipio NGP
Poetic SlimLine
Devicewear Ridgeline
iFrogz Script (Worse case I have tried so far)
To be honest, most of them were pretty good. Especially some of the cheaper Amazon/Ebay cases (i.e. Khomo, RooCase, Poetic), they are good enough and priced low enough that it's hard to justify something pricer or a brand name. To me it all comes down to which style case you like the best. Even some of the folio cases do things differently from each other, and once you figure out which style you like, then it's easier to find a case to fit that style.
I have found that for folios I like the stand style that both Speck and Devicewear use, but I prefer the Devicewear because it covers the entire iPad (Speck exposes part of the back), has the sleep/wake function, and does not need or have the silly clasp (magnets hold the case shut well enough).
If Switcheasy releases the Canvas, then I will need to take a look at that one since it has always used a similar style, so I would want to see how it matches up with the Devicewear Ridge.