The SRX neck is pretty nice. It serves people well who want something a bit thicker, but still not Pbass fat. While not THE SAME, It reminds me of the neck on my Fender Jaguar from the original run (the newer ones are said to have more of a standard Jazz neck, which is a little thicker.), albeit with a little flatter fretboard radius.
The other nice thing about the SRX is that if you don't end up liking the pickups, I believe they will accommodate typical EMG size/shapes. and there are a few pickup makers out there that offer pickups in that style, besides EMG. So you should have options.
There are (at least) two eras of SRXs. I haven't played the older ones but have read that they are a completely different animal than the new ones. Both of mine which are from the modern era are very thin. Maybe not quite as small as the SR700 but much closer to that than a Fender. If a high end SR is a 1 and a P bass is a 10 I'd call the SRX neck a 2.
