IMHO, don't waste your money (particularly if you consider a 16.5 a "big purchase"). For far less money, you can buy yourself an inexpensive wet / dry vacuum (for less than $30 new) and a used record player to spin the record while "scrubbing". Get a a set of disc doc brushes and some MoFi Enzyme Plus solution and your set for well under $100.
The big advantages of the VPI are 1) it's a self-contained unit, and 2) it's "pretty". But bang-for-buck, I'll take my DIY solution any day of the week.
If you think a Spin Clean does a good job, wait until you vacuum after an enzyme soak / scrub.