I've got the Aspire 6935 (with the P7350 processor) and I'm amazed at how well it's been made. I actually work for one of Acer's main resellers of laptops on the internet so I'm aware that the previous generations were appalling in terms of build quality and for after sales support, but this new Gemstone design hasn't so far given us any issues at all.
To be honest, the service centers for aftersales support are a bit hit and miss really, in our experience, we have VERY few issues that need to be chased up by ourselves, but we have heard of horror stories on the internet and across forums.
Back to the laptop though, I'd honestly say get one, it's one of the best laptops I've used in a while by a long shot. The only negative point I've got against it though is that Acer preload a ton of crapware that took me approximately an hour to uninstall when I first received it. Apart from that though, brilliant laptop.