I'd say this may work for people who don't have a good ear for music or specific key tones yet. 
I'm not sure i follow what you mean by that, Mr. T. As i stated before, i got this idea from
"Jamal Hartwell", Mr. "Urban Xtreme" himself. The same guy who successfully created & sold "advanced instructional" keyboard DVDs. lol Are you suggesting that Jamal
"doesn't have a good ear for music?" 
Also, let me be clear just in case some don't quite understand. This method is
not for
"ear or pitch training". But rather
"physical, soloing finger configuration" practice, WHEN YOU WANT TO ENJOY SOLOING TO YOUR FAVORITE JAM!
(In all 12 keys)========================================================
Example, T-block:
Imagine if you and i were at a keyboard, and your favorite fast cut was playing. Then i say to you: "T-block, let me see you solo to that!". You then start to solo
(rippin' it up like an LGM BEAST on gamma ray! lol).
Then, i say: "Ok stop and close your eyes." I then change the key on the transpose button...then tell you "Ok T-block, open your eyes -
NOW try it!....Then you notice that the keyboard is in a different key, so in about
1.38 seconds flat you find the
NEW notes or
"finger configurations" to play, in order to stay in key with the song!
I repeat this process with you over
all 12 keys. Through this unique process, you probably found that some of those "transposed keys" were
tougher to play in than others
(that you have already fully mastered).
==========================================================
The whole point is: you were able to "ENJOY JAMMING" to your favorite joint, and did so in
every key FOR SINGLE NOTE SOLO
PRACTICE!...and you never had to somehow change the key of the
song track the entire time! You just let it
Jam On! while you went through all 12 keys, gettin a
GOOD Ole workout!
(am i comin' through now?...can you see it? lol)In this example, your use of technology is no different than what athletes do everyday, where some prefer antiquated old fashioned ways of "working out or training", while others prefer "new technological advances" in equipment that they like to use.
BOTH accomplishes the same goal, except technology simply gives you "more conveniences"
(treadmills with meters and info, machines that give you computerized feedback, etc...) that older technology just doesn't provide.
Both exist, neither is
bad, because both ADDRESSES SPECIFIC AREAS.
In the T-block example above, playing in the
weaker keys clearly
"addresses that area of concern", and allowed for you to "practice in the weak key(s)"
TO YOUR FAVORITE JAM with the simple press of a button - only because of technology.
And again, this technique does
"NOT" deal with "ear or pitch training" but rather
"finger configuration solo improvement in every key", and also...this has
ZERO to do with "performing live at a function" using the transpose button. This only serves as a "12 key solo practice mechanism" that happens to be
fun as well, while you're jamming along with
"Beyonce Got Back" that T-block just LOVESSSS to solo to! lol
If i didn't make this abundantly clear this time (with all the nuances & details), i don't know what else to say! lol
Oh, and by the way, the "weak keys" example above, was purely fictional and strictly for illustration purposes. Because we all know that T-block HAS no weak keys!...He might have a weakness for Alicia Keys, but NO weak keys!...He might play the keys every week, but NOOO weak keys! lol