Michael "Angelo" Batio had a 29 fret washburn, in his vid speed kills, and if speed does kill, he would have been on a genocidal level!!
anyhow, the top frets are pretty unuseable cos of their size, however they are good for flashy ornamentation, and if you just need the extra high frets to end a run on, and i have designed a 29 fret guitar, its quite cool if i can find it ill mail it to ya if you like, its a turbo cad 2D 6.5 format.
cyas
mike