Writing a multi-tenant Rails 3 app for deployment on Heroku

I'm building a Rails 3 app for deployment on Heroku, and I'm wondering if there are any recommendations on how to handle multi-tenancy in my models. Half a year ago, there was a related question (#3776593) posted on here, but it didn't get many answers. I've also watched Guy Naor's presentation on writing multi-tenant applications with Rails, but it seems like 2 of the 3 proposed solutions wouldn't work on Heroku. I'd link to these, but new Stackoverflow users are limited to 2 hyperlinks.

I've also come across the following tools:

• http://samuel.kadolph.com/2010/12/simple-rails-multi-tenancy/
• http://blog.codecrate.com/2011/03/multitenant-locking-down-your-app-and.html

Just wondering if you have experience with either the multitenant gem or the simple-rails-multi-tenancy gem. Seems like the most straightforward solution would be to simply put a belongs_to on all my models that need to be under an Account, but I'd really like to know what you're using in the real world!