I can't comment on the nude colour, as I have only seen the black. But I did try on the black plonge lambskin Alexa in a store recently, and I loved the leather quality. The plonge lambskin is soft and textured, not entirely smooth but with a weathered look that mixes beautifully with the glossy snakeskin trim. To me this bag is an attractive mix between rocker chic and everyday elegant - it works equally well with a business suit or jeans.
I was afraid that the lambskin would feel too soft and thin, compared to the thicker buffalo of the oak and ink Alexas, but since the bag is lined this isn't a problem, it feels quite sturdy and holds its shape well - thanks also to the snakeskin trim that is kind of stiff and holds the bag together.
I found that the hanging straps on the front were a wee bit annoying when trying to get in and out of the bag, they are fastened with magnetic poppers and just decoration. The real lock is the postmans lock. But I guess you would get used to how to handle them, it was not a big problem, really. (I'm used to Bayswaters with just the postmans lock and no additional straps).
Inside, there was a small cellphone pocket and a zipped pocket, the bag is quite roomy and I would probably use some kind of bag liner in it, for extra pockets and some added stability (but I prefer structured bags).
The nude colour is probably sensitive to colour transfer from dark denim etc, as are all light lethers, but I dont think this bag is more sensitive than any other light coloured bag. The plonge lambskin has a weathered look, if you get some tiny scratches it will not be a huge problem. I think that a little wear will just add to the character of this particular bag.
The messenger strap is very long, most of the girls have made extra holes in their Alexa straps. You could also double the strap by opening the buckle and threading the strap through one of the loops, and then re-fasten the buckle and attatch both clasps to the other loop. That way, it makes a shoulder bag.
Good luck, and please post pics if you decide to get it!