One of the nicer globs for small scopes, M55 is a rather loose globular much like Omega Centauri. From memory it is also a Class III like Omega. Using high powers (100x and above) the glob looks more like an open cluster in my C6 (6"f/5) than a globular. Numerous stars are also resolvable in my Orion 80ST at moderate magnifications. And I can distinctly detect granularity in my tripod mounted 15x70 binocs. As it is so "loose", the globular does not have a condensed core and therefore appears dimmer than other "more concentrated" globs. Only problem with this one is that it does not have very distinct signpost stars to guide you to it. see my sketch at:
http://www.geocities.com/dhumpie/dastro/m55.jpg
Darren