You could generate a lot of cash out of this domain though believe me if you are planning on developing a site to defame another company, you do need to seek some legal advice first.
One of the previous online marketing companies I have been associated (One of the largest online marketing companies, whom i wont label here) had a similar ex-customer purchase the same style domain - the company name with 'sucks' on the end.
The problem, with this is that you have crossed the border of giving you opinion to defaming a company on your own personal views, views which may impact their reputation and future sales.
The company i was associated with eventually sought legal action and sued the customer for Deformation, the company won and the site has been shut down with a *7 Figure* dollar compensation ordered by the courts.
The fact the company succeeded shows the laws view on Deformation, this company was internationally based as well.
Also you need to realise that even before they spend money suing you, they can simply have their lawyers write a formal letter to the ISP or Hosting company, and the Hosting Company will hut your site down, fearing a lawsuit.
Any money that you make by defaming another company will also definitely be ordered to pay back in compensation, IF the company successfully sues you.
So make sure, you style the site as 'Informative - based on facts' and not a site that has big lettering saying SEDO SUCKS, and telling everyone not to go there.
Just my advice