the deluxe 58 is the evolution of the Jr90. Same neck, same neck joint, only real difference is the non 'tele' style control layout, and the carved top.
Every thorn I've played, without exeception, has been remarkable. I admit I'm a total fan boy now, and Ron's become a friend in the process. But I absolutely adore them. No better fit and finish and attention to detail in the industry as far as I'm concerned.
The set neck D58 in korina will def. have a little more snap over a mahogany body version. The GT90 P90's are amazing. Little mroe 'snap and air' get it with a trem.
Mark Goldenberg is touring with one now (He's ex-jackson browne, and currently playing with Hue Laurie among others..amazing guitarist).