Impressions after a couple of weeks of use...
Short version: it's fine. Just the job for what I need it for.
Longer version: I'm really enjoying having the electric assist on the commute, especially for the final leg home from the station in the evening, when I'm tired and it's cold and dark and I can't be bothered to make the effort to push up the hill. However, I did have an issue one day where I neglected to recharge the bike and so I had no choice but to do that final leg entirely under my own steam. And without the e-assist, it's a bit of a dog to ride uphill - mainly due to the weight. The Halfords website claims a range of about 20 miles, which sounds about right to me based on my experience so far. I have been using it quite heavily - partly through sheer novelty value. It's fun just zipping along at 25kmh on the flat with only the slightest of effort, but also lazy - I should be more sparing and save the battery for when I really need it, to avoid situations like the aforementioned. The other main benefit of the e-assist is getting going again eg at traffic lights - obviously commuting in central London is very stop-start at times.
One thing I've noticed is that the power doesn't always kick in when you want it - or so it has seemed a few times. I'll need to diagnose this properly. It might be to do with what gear you're in, the gradient, your speed, things like that. I'm not sure. Hopefully not a sign that the electronics are shonky.
I've had to fold it up a couple of times on the train, when it's been busy. And that has been less of a faff than I feared too. OK, so it's far from being as compact as a Brompton when folded, but it fits in the luggage racks on the HS1 Javelin trains, so that's fine. Folding and unfolding is pretty straightforward too. The only real criticism I have is that it doesn't stand up when folded, so you have to lean it against something to stop it falling over.
I had a phantom flat tyre the other day. Got the bike out of the garage and the front was a bit soft. I didn't dare try to remove the front wheel so attempted to repair it with the wheel in situ, which was a bit awkward given there's also a mudguard in the way. Only I couldn't find the puncture anyway, so it must be a very slow one.
As mentioned in t'other thread, I'm thinking of upgrading the tyres. I think the ones supplied are fine for now but they're probably contributing to sapping the power a lot more quickly than is strictly necessary. They're perfectly OK for riding around London streets though.
The only other thing I've had a problem with so far is the thick and squidgy saddle. It's horrible. I really will need to change that at some point. The discomfort is probably exacerbated by the very upright riding position.