I used RAIN when I was in Edenvale before going to Harties. My average daily speed was 85Mbps.
Then I got fibre so cancelled RAIN.
In Harties it was simply unusable with no way to fix it. I have friends there using RAIN and their complaints are the same. I think they are moving to another provider, but unsure.
I am now in Hilton, and it is better here. My connection does not drop like it did in Harties, but random speed tests can result in anything from 1Mbps to around 25Mbps. The key is my connection holds, so I am okay with it.