Rrecently bought one myself . I like it alot ! I sort of got accustomed to at least a factory FCD and missed it . With this you can readout instant FE and *more* it really keeps your interest piqued until good habits become second nature . Just get the danged thing !
If you decide the SGII isn't for you , put it up for sale in the 'For Sale' section here or on eBay . If you are interested , it also will help with engine/drivetrain maintainence with it's 'scan' feature . It should help save a few $ in the end .