Quoted from spinal:

Wait until 1.0 code for any pin you intend to buy from now on (1.0 means feature complete). This means wait until 1.0 and then buy NIB if you wish or buy from previous owner at that time. At 1.0 code, when all features are there, that is the time to decide how good the game is.
We can no longer assume that Stern will make it all OK in the future - they are pushing more and more code promises into the future for an increasing number of games. In this regard they are writing checks to our community that cannot be cashed.
We all know that once someone has your money there is less (little) incentive to do the same level of work HAD they not been paid in advance. We would never pay someone in advance to paint our house yet this is exactly what we are doing with pinball.
We have all contributed in communicating to Stern that any level of incomplete code is somehow now OK so it's time to draw the line.
Just say NO 'til 1.0. Make the pledge. The pins will all be available for you to buy in the future - just exercise some patience.

Quoted from Rockytop:

I would wait. GOTG looks to be the better game in a lot of ways.