Funny you ask I played an Ibanez SR 1305 today in GC and it was great! I have been GAS-ing over this bass on and off all year long. I might just have one in my arsenal sooner or later. I also played an Ibanez BTB 25th Anniversary 6 string bass that sounded great.
The QC is great (but it's not quite at the level of the Japanese made Prestige basses). The preamps are the same at both levels according to
Sweetwater. Either way, the preamps in the Premium and Prestige basses are a huge upgrade over those in the regular Ibanez basses. The Premium line is the sweet spot between price and quality. The SR 1300 series goes for between $1,500 and $1,700 new depending on how many strings it has. The Prestige basses cost at least $2,400 new. So I'd say the Premium line is worth it for the money if you're looking for an active bass.
I played the SR 1305 right after playing a $2,850 EBMM Stingray Special. I liked the Ibanez a lot more believe it or not!