do not get a 3-d. They truly suck. The best stand-up on the market now is the kawasaki 800 sxr. If you are buying one for personal fun get that one. If you want to carry a passenger, you should get the sea-doo. When you do go to buy one, get someone that knows something about them to check it out for you. You want to look for lack of maintenance issues, or if it has been sitting up for a long time, or salt water riden vs fresh water, etc. I use to race them, so be on the lookout for older race machines either souped-up or "engines been replaced" because the number dont match up. Most of them have been rode hard, and you will spend more time tinkering with it vs riding it.