There are a lot of things to consider when buying fitness equipment for your home as the equipment is expensive and you need to make sure you have exactly what you need in the space that you need to have it in.
1. The first thing is the space you have, you need to make sure that you measure the space out and determine the size of the machine you want to buy so that you understand how much space it will take up in the room you want to have it in, as you also want to make sure you have a lot of spare room to move around weights potentially and to take a break in if need be.
2. The most obvious one is make sure you know what the machine does so you know how to work out properly on it, nothing could be worse than to assume a machine can scratch the itch you have been wanting to work out only to find out that the expensive machine you purchased doesnt quite cover what you wanted as extensively as you may have thought.
3. Make sure that the machine is comfortable to use. This could mean a few things, if it has a seat to use while working out then make sure the seat is comfortable or maybe read some reviews about the seat. If its something to do with your hands you might want to find a bar or device that doesnt scratch or hurt your skin in any way, and if this cant be avoided you may want to consider investing in some workout gloves.