Some things are just bad ideas for online purchases and large scale home fitness equipment has to be one of those categories. There are just so many things that can go wrong: assembly, noise, breakage, repair. It's hard enough to make exercise a habit without a shortcoming of the equipment getting in the way.
Buy something at REI or a place with a generous return policy. At least then if there is something minor that keeps you from using it, you can return it easily. For example, I got a bike trainer and it's too noisy--my downstairs neighbors complain. So at least I know now that if this stops me from using it enough to make it worth it, I have a good reason to return it.
To make an online purchase of equipment like this requires IMPECCABLE, TOP SHELF credentials from the manufacturer, which Pro-Form, and this device in particular, clearly lack. Don't do it.