The following links will provide you with a good overview of the situation:
http://www.nhs.uk/Conditions/Corticosteroid-(drugs)/Pages/Introduction.aspx
http://www.nhs.uk/Conditions/Corticosteroid-(drugs)/Pages/Sideeffects.aspx
I'm a reluctant long-term user of corticosteroids in the sense that I was not initially keen on taking them as I had some knowledge of their side-effects. However, I trust my doctor implicitly and right now I take 30mg a day of prednisolone for three days and usually manage to leave them off for a week or fortnight at a stretch. They don't appear to be doing me much harm using this regime.
Women need to be aware of the osteoporosis risk at high dosage. Years ago the so called "moon face" was distinctive in high dose users of steroids but it's unusual nowadays. Ultimately though, it's best to remember that steroids only serve to mask the condition on a temporary basis. In no sense can they be regarded as a cure.
If they work for you and enable you to get around more easily, judicious use will lead to no harm.