There are a lot of cheap monophonic bass synthesizers available in VSTi format. For over a year I tried to decide what if anything to buy. Finally I decided on The Beast and have been very happy. The Beast is easy to program and sounds great. You can get smooth bottom or a real growl. This is now my first call for synth bass.
I don’t want to repeat everything already stated. Instead I will make a couple of comments about performance. When I first tried Beast and Claw they refused to work properly in my setup. I don’t know if the issue was Sonar, the wrapper, the graphics card, or something with The Beast. I never had any problem with JunoX2 which was the first VSTi I ever bought from the Internet. As The Beast and Sonar evolved I tried again. It now works perfectly in Sonar using DirectiXer.
One thing that several low price bass VSTi’s seem to be missing is the ability to control modulation from a wheel as you can with a MiniMoog. This feature is now in beta for the Beast and should be available soon. This was the deciding factor for me. I prefer to play Moog style bass lines, not the simple TB303. I can now do that with The Beast.