I understand where you are coming from @Chungcyk although if you can renew before January then you are in a good position. Barclays bikes are fantastic when they work, sadly there are often problems of availabiity and rotation – why they dont leave docks half full is beyond me.
I use the bikes as a luxury not a necessity and for £90 you can purchase a high quality traditional town bike. You just have to take into account security, parking, and maintenance. Still far cheaper and more effective than bus, tube, and car when in London. But if you are happy with the current setup, which will hopefully improve given the extra cash, then the extra hassle ought to be a consideration.