[beetman]

Betfair isn't open to Americans, Tradesports's repeated downgrades by SBR make Tradesports a non-viable option, so Americans are limited to Matchbook and Mansion as far as exchanges are concerned. They're both solid outs, but they don't offer props, parlays, teasers, etc. Exchanges are a great way to get "no-vig" lines, but you'll very rarely find a rogue line there.