I'm a member of several groups, Sussex, Cambridgeshire, Hampshire, Glamorgan and Camarthenshire. I joined all of them this year. I intend to join some other areas of intertest next year too, mainly Wakefiled and District.
However, I will NOT be renewing Camarthenshire FHS subscription as it was by far the most expensive FHS I joined and the one with which I am least satisfied. I may or may not renew Cambridge as only a very small amount of my family originates from there.
I must say however that I LOVE Sussex Family History Group, I enjoy the Hampshire quarterly journal, but find the members services quite poor (not in scope, but that they seem to be very money orientated ie you have to pay for everything. A search of the marriage index cost me £16.00)
Anyway, in short, I would highly recommend joining a FHS.