If that's the case then it's worth less than half the cash value of your Sandberg. As for whether they will compare as basses, only you can make that call, you might find the Spector fits you well even though it is more of a budget instrument. I'd only trade with some cash your way though, based on the info we have anyway.
*Edit - of course you mentioned a Boss br-900cd too. In terms of new values, if you bought one of those and a Spector Performer you're near enough looking at the cost of a Sandberg Basic, yes. Whether it's worth it or not though is up to you at the end of the day.