Hmm I've probably installed over a thousand brake controllers... and I've never once heard of Redarc. Upon doing some Googling, looks like it may be popular down under, but I really couldn't tell ya anything about it. I do like the cleanliness of it.
My recommendation is just go Tekonsha. Most hot shot drivers or horse people swear by them and I've sold God knows how many and never had a single one come back with a problem. I've also installed a ton of Reese, Draw-Tite... Any of them work fine for the average joe that only pulls occasionally.
How big of a trailer are you pulling?
If you're worried about the ugly brake controller in your cab - just wire it up so you can unplug it and take it out when you're not using it.