I ended up getting a PolyScience 300 a few years ago. Was going to be a Christmas present from the wife and we'd found an ex-display model for £300 off, but the company accidentally sent us the wrong box (someone else got the Vacuum sealer - we got 10kg of sous vide bags!). They were great about it and sent a new PolyScience 300 out straight away and told us to keep the bags.
Couldn't have asked for a better outcome, and have to say haven't had any issues with the PolyScience (touch wood!). Needs to live on a worktop somewhere though as it's not light or easy to move around. Is great being able to seal liquids though - do a great Creme Anglaise in the sous vide
I was initially looking at the cheaper Chinese (or similar) chamber vacuum sealers but decided to spring the extra for the PolyScience as I trusted the brand and felt I'd be able to find more about it online if I ever did have issues.
edit:
I'm sure they're completely fine for home use. I'd look on eGullet or somewhere like that as they have big chamber vac threads. But I've had my eye on a shiny £1k Polyscience one for ages. Although the middleground Sous Vide Tools ones for £600 etc are pretty tempting.
Just to say that Sousvidetools is where I got my PolyScience from and couldn't be happier with the service. My issue was an honest mistake during dispatch and they fixed it without any issues going out of their way to ensure that we got the chamber vac in time for Christmas