In fact, it's actually only a piece of foil that covers the slot and requires you to peel it back to gain access to the expansion slot. In addition, iFixit notes that the HTC Surround is solidly built all around and that layered internals aids in keeping it somewhat slim. However, they gave the handset a 5 out of 10 score in repairability since you'll more than likely void your warranty in attempting to gain access to other components of the device – such as the front panel and LCD.
If anything, the only things that most non-adventurous owners would do to their prized smartphones are things like replacing the battery and potentially swapping out the microSD card with something with a bit more capacity. Anything else after that, you'll be walking that fine line of potentially damaging your handset if you're not adept in taking it apart.
source: iFixit via WP Central