There was very little problem where an entire Suntour system was used. Most of the reported Carrera problems were confined to bikes with a mix and match of powertrain components from different manufacturers.
The one remaining Carrera cutting out gremlin is in late models with the detachable display. This can sometimes vibrate sufficiently in the QR mount that the contacts momentarily lose their connection and the bike cuts out. A rubber band, velcro strap, etc cures this. A minor ballache, but not a real problem now it's known about and understood.
Late model Carreras with full Suntour and fixed displays do not seem to be suffering any recurrent problems. Theyre not infallible, of course, but nothing recurring seems to be making itself known.
Halfords modestly reckon they've sold more Carrera ebikes in the UK than all the brands combined. This may be true, and if not its certainly a very noteworthy amount. Nevertheless, go surf an ebike forum and despite the enormous Carrera sales figures most of the people seeking help with faults actually own bikes from other manufacturers, strongly suggesting the reality of the situation bears little resemblance to the gossip.
The paper spec of the ezego is respectable, although mechanical discs brakes are perhaps a little disappointing. The Subway electric is a similar machine and gives hydraulic brakes and 15Nm more torque, althoughnyou then have to spend a little extra on guards and a rack to match the ezeogo. As mentioned above, odds are it rides ok, reliablity may be a bit of a gamble from a lesser known brand and technical or warranty backup is an unknown quantity. Its probably a fairly safe bet, but a gamble nevertheless.