I've gone with Florida Mobility Rentals for next year. They're by far the cheapest I've found ($215 for 14 days), and after about 15 minutes' webchat, the woman actually rang me (and I'm in the UK), and we ended up chatting for 50 minutes!
This year I hired from someone with opening hours of 9am - 6pm - and even well after 9am I was getting only the answerphone. Needless to say, when the
ECV broke down, it was 6.25pm so I was completely scuppered. I left a message on their answerphone and also emailed them once back at the resort asking them to bring a replacement scooter to AKL where we were having breakfast and even instructed them to have bell services call me up from Boma (I checked in with Bell Services on arrival to make sure they'd do this), but had a very stressful breakfast not knowing whether they were coming or not. I even rang 3 or 4 times, but even as late as 9.30am still only got the answerphone. On my last call I said in frustration, "Don't you ever answer your bloody phone?!"
In the end I got a very rude text message when I finally finished breakfast and came back up to ground level saying that they were here and WHERE WAS I? Of course, by the time I got outside they'd gone. Tried ringing the driver's mobile he'd left me in the text, but he wasn't answering. While I sat there wondering what on earth to do, Bell Services came outside to find me and told me that they'd actually left the scooter with them. It was in a disgraceful condition, though - the front tyre was completely bald and the seat rocked slightly side-to-side.
So, my main criteria in finding a hire for next year - especiallly as it's a 14-day hire - is that the company has an out-of-hours number for me to ring and that someone will actually answer the phone!!