[dba-SQLServer] Optimizing queries with in() - SQL Server 2005

I have a lot of queries where I have to look for multiple values.  I have
been using an IN() clause but I am advised that is very slow.  OTOH I built
two queries that use an IN() in one query and a bunch of ORs in the other
and over a 56 million record table they were both so fast I couldn't see the
difference (Indexed column, containing values 1-9 and A-T (under 2 sec)

Any comments?

John W. Colby
Colby Consulting
www.ColbyConsulting.com