Welcome to the forum!
Personally, I think you made a good choice. The EXP is the same size and shape as the standard 1.5, so the flying experience will be very similar to what you would get with a standard 1.5. The biggest differences are in the materials used and the panels in the construction of the kite. However, for a beginner, the flight characteristics will be similar. I've been flying revs for about 2 1/2 years, and still fly my EXP frequently as it is one of my primary "full sail" kites. I'd love to have a B-Pro because the construction on those custom kites is very, very nice, but I still get lots and lots of enjoyment from my EXP.
Like any sport, you can certainly buy higher end equipment, but until you reach a certain skill level, you won't be able to appreciate the subtle differences in a higher end kite. Tuning the flight characteristics by adding "brake" to the leaders on the handles will make a bigger difference to your flying now than whether you are flying an EXP, a standard 1.5, B-series, or Pro. There are some threads on the forum about tuning the handle leaders - it's very easy to add some longer, adjustable leaders to your existing handles. Also, IMHO, at this point in your flying, different kites for different wind conditions (i.e. a vented kite for higher winds) will have a bigger impact on your experience than whether your "full sail" is a standard or an EXP. Careful though, flying revs is very addictive . . . and you'll probably end up with more than one kite. I did . . . and I can't really talk about it . . . because then I'd have to admit that I have a problem ;-)
Learning and flying time will make a bigger difference right now than which Revolution kite you buy. Watch the videos, go out and fly so that you get some practice, and you'll find the EXP to be perfectly enjoyable. Don't get frustrated by the learning experience - and connect with some experienced fliers (even if you have to go to the Netherlands) to learn from them. If you are like me though, once you start flying, you'll probably want to start saving for your next kite now, because you are going to end up with some more revs ;-)