I installed my $35 ebay rear strut brace on my 04 wagon this morning. 10 minute install, and the quality seems just perfect. It's sturdy, the welds and material look plenty strong, and it was a perfect fit. Only minor cutting of the carpet trim "caps" was required.
I heard about these braces on the forum, and all the other reviews were pretty positive as well. I already had a Cusco brace up front, so I emailed the guy and he split the pair and sold it to me for $35 shipped. Not a bad deal.