I'm generally not a huge fan of reverse cambered boards, but I've owned a 154 Joystick for the past 3 years and love it. I don't ride it all the time, I have a Capita that I use as my main board at Northstar, but when it snows a bit or I ride a bigger mountain, I really enjoy the Joystick. The one thing I hate about reverse camber boards is that they don't have the edge grip that cambered boards do (duh), but the Joystick is a stiff enough board that when you do put it on an edge, or are going fast, I don't feel that I am going to wash out on it. It's definitely doesn't hold an edge compared to some of the other boards in my quiver, but that is to be expected. I just change my riding style to fit the board. I really only ride it when it snows a bit at Northstar (not enough to bring out a Malolo), when I'm riding a bigger mountain but still want something playful, or when I do want to ride a V Rocker deck.
I do enjoy it in the park. Like I said, it's stiff enough to handle the bigger jumps and stuff, where more flexible RC boards will fold and wash out on you if you don't land on the bolts, but the V rocker still makes it fairly easy to play around with it/do flatland tricks and press on rails/boxes.
Overall, I really enjoy it, and it'll be in my quiver for a while. I definitely recommend it. They pulled the plug on the Joystick last year, so there will not be any new models coming out, so pick one up if you can. I sold my 2010 and bought a 2012 solely because of the graphic from last year. One of the best graphics to come out in a while IMO.
I have a 2010 161 Joystick and for the most part I love it.
I very rarely took it in the park but didn't really have any issues w/ it going off of jumps. I never hit anything big though. It has pop to it and you can butter with it. I just bought a Gnu Rider's Choice Aspen this year and my Gnu butters better I feel like (if that means anything to you). I'm also not the best at buttering. I've only hit a few rails with it and didn't have issues. They were most likely beginner rails.
I would hit rollers and side hits and would get decent pop. I would ride moguls with this and also in the trees and both were a lot of fun. In fact, this board reminded me how much I enjoyed moguls. Plenty easy to whip the tail around. The board is very forgiving and definitely saved me more than a few times.
For the most part it's stable but you'll feel it start to get some chatter around 40 mph or so. It'll occasionally feel like it'll wash out, and there are times when it definitely washed out. The board is fast but my new Gnu seemed significantly faster (it was also brand new).
I also never really felt comfortable skating around on it with a boot unstrapped - that could just be me though.
I don't plan on getting rid of this board. I definitely feel like it made me a better rider. It's a lot of fun to ride all over the mountain. I honestly don't know though if it would make a good park board, I don't really go there. It's a solid board though. Is it new by any chance?
I've taken it to a Killington, Mount Snow, a few smaller north east mountains, Snowbird (it's first trip), Breckenridge, Arapahoe Basin, Loveland, Keystone, and Vail.