Hi,
I've had my HMKOC kitchen installed for just over a year so I can give you a bit of a longer term opinion. Sorry this is a bit of a brain dump of my experience so not sure what will be relevant.
I have the other type of catches after reading (probably) the same things as you about the magnets. You do still have to give them a pull/push too though so not sure whether it's made any kind of a difference. They seem to be holding up well though and they make a nice sound when they close.
Our kitchen fitter painted ours using two coats of F&B modern eggshell and he did a great job but it is starting to chip in places which I think is probably just what happens with hand painting. I had 3 kids and a dog so it gets a good bashing about to be fair.
I don't think I'd have changed anything in particular, I wish I could have squeezed in two dishwashers but there just wasn't the space without sacrificing the bin unit which I really wanted.
I am really pleased we went with the reeded glass in the worktop standing cupboards which look amazing for the extra £100 it cost. I am also very pleased with the cutlery insert and my spice drawer is my favourite bit of the whole kitchen. I think they were about £60 each so definitely worth it.
We went with different handles which after ordering many samples I got from Amazon of all places. We also used a local stone yard which we've used before for our worktops and we're very pleased with them.
I went to the shop in Esher to have a really good look before ordering and I think it was really useful to see the different types of doors and plinths. I wanted very plain and it was useful to confirm those choices by seeing them in the flesh.
We have a peninsular with a 30cm overhang rather than an island so not sure whether I can be any help there.
Their customer service was very good too in my experience and they were very receptive to a couple of small issues we had with the bin.
Overall I love it.