I've got a VPS with them in Houston, been with them for almost a year. Had an issue back in July with my filesystem going read-only due to issues connecting to the SAN otherwise things have been pretty smooth.
WonderProxy can help your team do localization testing from around the globe. With more than 200 locations there's no excuse for not testing your website.
The Where's It Up? API can help multiply your monitoring infrastructure. You can request pings, traceroutes, DNS checks, and HTTP checks from all across the WonderProxy network.