The sidstation certainly has some "boutique"-price tag ;)
Some of the available SID VSTIs are nice, but for the most part they lack authenticity and most importantly they rarely (this should actually ready "they don't" I am using "rarely" only because somone might have written one last night that's actually incredibly good and I missed) have a sound engine as powerful as the one TK implemented. The other obvious advantage is the physical control surface. Nothing beats fiddling with real knobs when it comes to programming sounds.
If you stick to the CS designs you've seen around here (TK's Step C, mb6582, sammichSID, ...) there's no programming involved, if you decide to change button and knob assignments you'll have to do some configuring (ie change some tables in the source code) no real programming is needed for that, no worries. Soldering the parts is pretty much all you have to do :)