IMO the N52te is a solid improvement over the classic N52.  If there is any significant negative its that I think they might have reduced the number of shift states from 4 to 3, and the pricing...  Regular N52s were going for under $20 towards the end of their production and can still be found for ~$30, and ultimately the N52te is almost physically identical and almost functionally identical as well save for a few differences, yet they go for ~$70
However my biggest complaint with the N52 was the responsiveness of the inputs.  The keys and buttons/d-pad and scroll wheel are all excessively stiff and clunky feeling, not something you want in a gaming device when the only resistance you want is just enough to keep you from making an unintended input.  The N52te solves this and keys are like butter in comparison and the product feels pretty damn near perfect, but like you said, its pretty expensive considering you can buy an actual keyboard for less, or get a good gaming keyboard for the same price (Razer Lycosa comes to mind)...
I think the magic mark is somewhere around $50 for either the N52te or G13 before I consider either one of them.  Combine the fact that you'll still need a keyboard to properly function and you start running into issues of space and arm spread.  What I would like to see is some of these companies produce a pad that can be quickly toggled between a gaming state and a number pad state (yes, I realize you could program it in yourself, but I'm talking about the layout specifically designed to keep that in mind) so that we could use such a game pad along with a compact 88 key keyboard