The Pro is an insult at the price they ask.
The Premium and LE are great though. People bash it constantly since it came out at the same time as a music pin with an amazing lightshow that gave off more than 5000000 candlepower . People have every right to trash the Pro ... that was a pathetic move on Stern's part.
The Premium and LE are a different story. I find the Premium and LE to be more fun than GnR for whatever it's worth (that's just my opinion ... I know I'm in the minority ... no need to downvote). Please keep in mind that I've only had about 6 hours on each machine. That isn't exactly a lot in terms of pinball, but that's enough to at least formulate a, uh, rational opinion .
The layout has a lot of classic Steve Ritchie kinds of shots. Flow is great. The spinner toy is pretty slick (I've heard that it is troublesome, but that's pinball ... spend an hour or two tweaking it and you should get it to work). The audio kicks ass ... theme integration is great. I also find the Premium to have the best art package of the three. If Stern sells their version of powerblades for LZ and you can get them at MSRP, I'd grab those too .
Since the game didn't seem to sell well, I wouldn't expect any significant SW updates. Something seemed unbalanced scoring wise to me ... and it also seemed like more could be added, but I wouldn't count on Stern to do much more with the pin ... Gary's already grabbed his cash much like he did with Star Wars when it was released (though that did get some great updates). While some of the problems with it kill it as a tournament kind of machine (damn shame given the shots), I can't see it being a bad pick for a home game. Music pins are always going to be in demand (only reason that Rolling Stones seems to sell for a decent price despite it being considered a dog like LZ ).
I noticed that you don't have a Steve Ritchie pin in your collection ... you might want to give it a try . I don't think you'll lose out in the long run and you might find that you like it more than the average player. If you are a Led Zeppelin fan, I think you'll really like it.
(I don't own either GnR or LZ and don't plan on buying either ... I have nothing to gain/lose by hyping or trashing them ).