I am very happy with the XB2. It was extremely easy to assemble and quiet when in use. I live in a one bedroom apartment so I wanted a reasonably light weight fold up bike. The one negative is that it cannot be locked in the fold up position as the locking pin holes don't match up. Apart from this it is fabulous.
Awesome product, love how quiet and portable it is. Surprisingly small for such useful product. Would've given it a 5 star if it's not for the faulty left foot pedal. Very good response from seller in responding to communication and sending the replacement pedal. Unfortunately the replacement is still faulty and had to get the pedal in local bike shop. Good thing is, it's a standard size pedal, so easy to get.