Be clear on the usage
Wheelchair lifts can be used almost everywhere and this is the reason why they come in different designs. The same wheelchair lift design cannot be fitted everywhere. For example there are wheelchair lifts that are designed specifically for public places like schools, colleges, churches and any other kind of public buildings. These lifts are generally inclined platforms. Home wheelchair lifts [http://www.abbeyaccess.com/WheelchairLifts-i-27-15.html] on the other hand will be built slightly differently and the same goes for those that are used for stages etc.
Consult the doctor
If you are looking at Stair wheelchair lifts [http://www.abbeyaccess.com/WheelchairLifts-i-27-15.html] for your home you might want to consult the patient's doctor first. This is suggested because every disabled person has very specific needs and these needs are not the same for every one of them. The doctor might have some inputs for modifications on the mechanism that you are considering. These modifications will only make both yours and the disabled person's life easier.
Lastly, you need to look around. Buying platform wheelchair lifts [http://www.abbeyaccess.com/WheelchairLifts-i-27-15.html] is like buying any other product. You need to do all your homework and research before you actually decide on what brand, model etc. you are going to buy. The easiest way to do this would be to visit all the dealers in your neighbourhood and see what they have to offer. Check on their experience, their customer service and support and the durability of their product. You can also ask your doctor for recommendations. You should only choose a brand after you are completely satisfied with what you see. Keep in mind that this is a commodity where safety has to be your priority so therefore cheap might not necessarily mean the best.