In short: I was a member for one month (in early 2010), and made several rather promising connection that developed into ongoing correspondences; then, suddenly, every single one of the profiles that I was in touch with completely DISAPPEARED! No warning, no explanation, no NOTHING. 
Of course, I sought help from the site, and after much exasperating and false excuses concerning the reasons why this had happened (e.g. they originally suggested that all of my contacts had simultaneously decided to suspend their profiles), they eventually admitted that they had in effect "sold" these missing profiles to another on-line dating site (the euphemism they used was "migration of members [...] to another site"); so the upshot is that these profiles were now no longer available to me through Match.com.

 Needless to say, I was ASTOUNDED by this HEARTLESS GREED!

"Match".com turned into "SNATCH".com. They took my money, made FALSE PROMISES, snatched my new friends away, and now I'm left with NOTHING after spending dozens of hours searching for, connecting with, and writing countless e-mails to these now utterly LOST PROFILES. (Oh, they did offer me 7 free days of extended membership. Wow! What generous compensation for this incredible disappointment and unsympathetic handling of their customers!)

My recommendation: AVOID AT ALL COST! There are plenty of other sites that offer far better service--many of them free of charge. Spend your valuable time and money elsewhere!