I've had a bit of fun with a new C Bellows system for my Hass. 503cx. Basically I'm just using up a lot of expired film and calibrating my light meter.
I'm still quite new to MF (it's been a little over a year since I bought my Bronica SQAi which was subsequently stolen and replaced with my Hass. 503cx and Bronica ETRSi kits) and am trying to keep the darkroom work up - I am in the process of developing my 'system' in terms of how I keep track of my shots, processing, keeping my chemistry fresh, etc. It's all so great and there's still so much I want to learn and at this point I'm just happy to be using the equipment I have and getting (relatively) consistent results.