I initially bought the official Dell leather case but found it to be cumbersome and not at all user friendly (looked nice, but had no confidence it would actually protect my Streak) so purchased this instead.
As the previous reviewer mentioned, it's a thick silicone type case which fits snuggly and has openings in just the right places for the speaker, headphone jack and charging cable etc. There are raised 'buttons' where the volume rocker, power and camera buttons are which line up perfectly with their counterparts. The silicone is a magnet for dust and pet hair, which is a shame - but a small concession as I now feel that if I dropped or banged it that it would be OK.
I was not expecting there to be a screen protector included as well but there was, and it was much easier to fit than others I've previously used with other devices.
The case does make the Streak much bulkier hence 4* rather than 5 (if you carry yours in your pocket this may make it too large), but mine goes in my handbag so this isn't an issue. I'm happy to just pop it in now without worrying about scratches and bumps than I was before so definitely worth the money in my opinion.