For the next topic about important thing you should consider before buy the juicer. You can use these check point to decide before get juicer also.
First topic you should think about is The Motor you can see this function at specification. If you plan to make various types of vegetables and fruits I recommend you look various speed of motor. The number of watt of motor is important (Breville BJE200XL Juicer is 700 Watt). If the motor has more watts this mean that you can make juice so fast but you must pay electric charge more.
Second thing is Cleaning. Your juicer should be easy to clean (I mean design of item) if juicer is narrow design or more small part, this is difficult to clean for you. You should consider in this case also. In addition to if that juicer has dishwasher safe function is good for you.
Third topic is Feed Tube. If you have big feed tube juicer this will make you easy and fast to make the juice. You don’t need to chip your fruits/vegetable at all, it is so easy.
Fourth topic is The Noise. You don’t want high noise machine surely, before you will buy the juicer you should open the machine to test noise at store or if you want to buy online you should watch video introduction or real video running machine.