^The basic XD design (the HS2000) has been available for five or six years now, with minor design changes as needed. There have been a few well-established rust issues, but as of May of this year (according to SA), all XD's are being made with a new surface finish process called melonite, which is similar in durability to Glock's tennifer.
If you want specific info about XD's, check us out over here:
www.xdtalk.com
Every question you could possibly have has been addressed at least once, and we pride ourselves on being a relaxed bunch.