I will enter the debate.
I saw the cutter in Topps, looks ok, but I would opt for a push cut Sigma if I was looking for a new cutter.
Having used Rubi for years & then jumped ship to Sigma I think that the Sigma is the best all rounder I've used, still own a Rubi & Tomecanic.
Once you get used to lining up your marks on a tile with the single bar in the way you will be flying.
I have still to use a tile that the Sigma wont cut, I've cut Gulf Stone Quartz that you shouldn't be able to do with a manual cutter.
Got to admit, not that I ever got involved in this debate,
Having been using a sigma recently, (borrowed) it'll be the next slide cutter I buy.
The success rate with cuts feels much higher, I say feels cos I feel more confident it'll do what I ask of it.
If that makes any sense.
Still not 100% at ease with it, but I'm happily taking 20-30mm rips off a 1200 tile, full length!
And rather than crossing my fingers and expecting a 50/50 cut rate,
I'm getting irritated if the cuts shears off, cos I know it can do it with ease.
It's just my lack of experience that lets the cutter down.
It's just a bloody lump of a thing when u have to carry it up and down stairs every day! Haha