Does anyone have experience with webloadtester.com?

I’ve used some of the company’s other services in the past, and I just received an email for some promotional pricing for Web Load Testing.
Their email says:
“We would like to
inform you about new Monitis web stress testing service (http://www.webloadtester.com).
WebLoadTester allows instantly check your website load handling capabilities.
You can enter many URLs, number of nodes, duration and number of simultaneous
users to generate web stress test. There is a special promotional price $1.98
per each order regardless of number of URLs, nodes and clients. The offer is
valid till 2/15/09.”
Looking at the site, it looks very interesting, and could prove useful.
Does anyone have experience with them?