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I do not know what you consider business or a good chat clients. I consult to a lot of small businesses (100 seats or less) and with the except of gtalk and trillian I would tell them to stay far away. The ones I would recommend are Skype, Lync, or AOL. The number of people on AOL is still huge, Lync provides a level of security that most others do not plus the ability to go from chat to video instantly. Skype is just about everywhere and simple to use. Gtalk is nice especially for those in a google environment. Trillian is not very secure but it allows connections to just about every service.