There is also a 10% off Wayfair coupon you can apply to this order dropping the price down to $491.82. To get the coupon, go to wayfair.com and after the main page loads, a window should pop up asking you to input your email address to receive the 10% off coupon. If you don't get the pop-up window, clear you browser cache and try again. You may have to input the address manually versus using the link in this post. Wayfair also occasionally sends 15% - 20% off coupons in your email, so if you're a previous Wayfair customer check your email.
To sweeten the deal, Wayfair also offers 3% rewards, plus whatever cash back/rewards you get from your credit card.
For a review check out the Powerblock Elite 90's Amazon product page for comparison.
If for some reason you don't want powerblocks, you can get the Bowflex 1090s using the 10% coupon for $488.83 w/ free shipping. Personally, while I own a set of Bowflex 552s and love them, I would pay the extra for the Powerblocks which can be upgraded to 130lbs, whereas the Bowflex are capped at 90lbs. Plus the powerblocks have a 10 year warranty vs 2 years.