Burst is suffering the VDI/Level 3 blues right now. They are moving to their own NOC soon I hear (though soon is apparently a moving target that changes quite a bit). Things may clear up for them regarding the downtime after that. Of course all the VDI hosts should be getting better uptime themselves as well *soon*
I've never been overly impressed with Burst - they do generate a lot of hate-mail. How much is genuine is hard to say as some of the people at Burst themselves do tend to fan the flames a little. They are quite large of course which always increases the target on their backs.
They are one of the few hosts to offer large plans so if this is a requirement (as I see it is), and you're not up to getting a dedicated server they're worth a shot. I'd lean towards Tera-byte myself, but it's a fairly even call between them...
Greg Moore