I have an old office chair that needs to be replaced, the seat up/down piston is expired and it no longer adjusts. Because it did fit under my previous desk, I left the arms on but now with my new table and correct height set for me I should take them off if I don't replace the chair soon.
BTW, I try to clean out the casters on my chairs along with DST -- I should do it today!
When looking at chairs, be aware of weight issues! Many of the cheepo chairs are based on people weighing 200 or less -- for those that are under the threshold, good for you! When my husband was large he went through even large chairs quickly but we would typically find a nice high quality "executive" chair on Craig's list for about $100 which was a better deal than a new $100 chair.