I own an SR535 and have owned many versions of the SR since their inception back in 1987.
Overall the construction of the 305 is decent. It can take some abuse and not break on you. The necks are like all other SR necks, slim and very comfortable, although the tight string spacing can be a P.I.A. for the plucking hand, especially when you need to slap & pop.
I don't think the 305 is very versatile either. I've not been able to get a wide variety out of tones from them when I was testing them. It sounds "thin" IMO.
You'd probably be better off looking around for a used bass. For the same price as a new 305 you'll have a wider variety of basses with better quality body wood, hardware, and tone, available to you.
The most important thing you can do though is to get out there and actually start playing as many different basses as you can. This is truly the only way you'll know if the bass is right for you.