I purchased a Music Hall USB-1 turntable after inheriting my dad's vinyl collection. I knew it was a budget table but since I hadn't listened to an album in years I decided it was a good jumping off point. I began buying some of my favorite new releases and listening to analog audio more frequently and the USB-1 seemed to be leaving a little "resolution" on the table. After looking at cartridges on the Crutchfield site I decided to buy the Sumiko Black Pearl cartridge as it was in the Outlet Store and on the advice at the Harrisonburg store. When I picked it up I found the packaging to be a bit over the top (nestled in a white jewelry box) but was anxious to get home and try it out. For the price I paid (Outlet pricing plus using some of my points credits) I was shocked. Installing the unit was straight forward so I was spinning discs in minutes. I immediately noticed much more depth to the frequency response and a bit more air in the upper end. Prior to installing the Sumiko I listened to Beck's Morning Phase in stereo so my sub would accompany my Focal 706s as the lower octaves were missing. With the Black Pearl enough depth was present to switch my processor to pure direct opening up the sound stage even further. My USB-1 doesn't sound like a Music Hall MMF-11.1 but it sounds darn good for the money invested.
Pros: Increased frequency response, simple installation, cost (for an audio upgrade). Plus it's just fun to tinker without changing an entire component in your system.
Cons: Slight increase in the noise floor. This is offset but pros above in my opinion.