This is the summary of consumer reviews for ProForm 505 CST Folding Treadmill with iFit Personal Training. The BoolPool rating for this product is Very Good, with 4.10 stars, and the price range is $599-$869.98.

The Pro Form 520 ZNi Folding Treadmill is the ultimate fitness solution for walkers, joggers, and runners who prefer exercising in the comfort of their own home. The treadmill folds up to a slim size, which also makes it perfect for small spaces. 

Customers rave that this particular treadmill has helped them lose a significant amount of weight, get healthy, or stay in shape, thanks to the ease in which it fits in a house, apartment, or condo. Most report a quiet sound when running, which makes it a great addition to any household. The treadmill has an LCD display window for monitoring distance, speed, time, and more, while also tracking fitness statistics like calories burned through the iFit app. The product comes disassembled, but most say assembly was quite simple, even with the help of customer service at times.

Some struggled a bit more with assembly, even reporting some broken parts came in the mail with the package. Others say they tried contacting customer service, but rarely could get a hold of a person at the other end of the line for support. Also, depending on how fast a person is walking or running, the treadmill may produce slightly louder noises when running.

Overall, the treadmill is functional for walkers and runners alike, and is great for space savers.