Yea... I didn't think so. I felt the same way, but I also knew that the $500.00 investment I had made in my N900 was worth protecting. Now, casing a sliding phone is not as easy as casing something that has no moving parts, such as an iPhone or the Nexus One. Because of this not all cases that are designed for the N900 are created equally, in fact prior to the OtterBox I had owned a soft rubber case for the N900 that was a very poor quality.
Thankfully the OtterBox was of a much higher caliber. Composed of two sturdy, hard plastic pieces the OtterBox clips firmly over the front and back of your N900.
Over all the case does not lend that much more thickness to the phone and the small amount it does add I feel is well worth the extra protection the casing offers should my N900 take an unexpected tumble to the ground. There are only two minor draw backs to the case. First is if you use the kickstand on your N900 often the view angle is reduced by a fair amount due to the extra thickness.
And finally - in case you hadn't picked one up yet, the OtterBox for the N900 also comes with a pair of screen protectors designed to fit the N900's screen. This way should you like to carry around your N900 in your pocket you don't have to worry about spare change or your keys damaging your hand held's screen. You can pick up an OtterBox designed for the N900 at the cost of $25.00 over on Amazon.com (More Amazon savings with these coupons). If you ask me the case is worth every penny, but in the end it is your device! So if you want to risk it taking a fall unprotected that is your choice ;)