The bikes are pretty good, but are starting to look tired. The pannier leans forward too much and the phone compartment is too small to accommodate newer phones. My bell was missing, my partner's bike creaked changing gears and we got one bike lock for two bikes. We hired the 'Cushy' bikes at $45 for 8 hours (which still feels steep, but that's $5/hour), and the seats aren't all that cushy! If you're expecting a seat with springs then you're going to be disappointed. The guy who served us in the morning wasn't that friendly, but the woman we returned the bikes to in the evening was.
All this said, Napier and Hastings are totally set up for bike riding! The recent cyclone has put some paths out of order, but there are some great paths, lots of cafes and everyone says hello!