First of all, I have to say that I am not especially an Iron Maiden fan - but I don't think they are a bad band, and the fact that they had their dedicated 747-airplane (and their singer Bruce Dickinson flew it) makes them sort of cool. But now, back to the important things: The game!
Iron Maiden Pro to me is a mixed bag. I really love the artwork (yes, it's one of the best packages recently), the gamemplay is fast and fun, and the layout by Mr. Elwin feels quite refreshing. I also think it has a high lastability, I constantly felt like I had to come back for more. The shots are challenging, there are a few difficult shots, e.g. the right ramp or the extra-ball target. Overall a nice experience - even to a point where I might consider getting one. But there are some drawbacks: For example the Pharao-Target. It feels a bit odd and takes the flow out of the game, there should happen something more satisfying than just hitting a target on the wall (just compare it to the ring on LOTR and you might know what I mean). Also, there's absolutely zero toys - but maybe that's the reason for a better gameflow after all - but come on, one toy at least would have been fun. It also does not have a video mode, which I consider a good thing (I hate video modes as they take away flow and focus). Also, the small upper left flipper feels a bit bulky - it's difficult to get shots right with it.
The modes are sort of a bit dull, too - at least that was my impression. I am not a big fan of the animations on the screen, as they sometimes look a bit cheap and too rendered for my taste. Multiball is relatively easy to achieve, so it's by no means like the rather unforgiving Star Wars, which takes quite a lot to figure out.
The music works surprisingly well to me - it feels like it was made for pinball as it seems to have a certain appeal that goes very well with the game. The songs are catchy and I even had them stuck in my head after playing it, I might even claim that this is the best Stern Band-themed-pin. The callouts are kind of cool, too. Overall audio-quality has been critisized by some, but then again keep in mind that lots of the songs are pretty old and that the recordings back then were possibly not the most sophisticated.
The lighting, well. Pretty much standard. It's solid, but nothing too special. Lots of white lights, although the playfield may seem a bit dark overall. I've seen better recently.
Thing is - it's a very solid and overall fun machine - but compared to Dialed In for example, I think that the gameplay is nowhere close to DI in terms of layout, flow, toys and modes. Also the lighting of DI seems to play in another league - but, to be fair, IM Pro is only 2/3 of the price of a DI.
Sorry to compare the game to another one, but I can't see why exactly this game is ranked better than DI, as it's less elaborated and less detailed by a far margin, even gameplay-wise.
I would not mind to have an IM Pro in my collection, though. It undeniably offers a great layout, fun shots and a good value-for-money ratio. I would love to try the Premium now.