I've got the 1/3 hp Innovative, and a spinner is definitely a great investment if you are even slightly serious about your bowling. Well worth the money for all the previous reasons mentioned. To top it off, build yourself a copy of the Revivor / Nu-ball oil-extractor for less than $100 and you are set, with a definite advantage over others that don't have these items. For sure though, buy the spinner.
Btw, I just saw there is a used Innovative 1/3 hp spinner for sale on BBE for $225, Myrtle Beach area.