I am an amateur turntablist, and the Gemini TT04 were my first and let me say, if you just started or you're relatively new you're going to love these. Their not to expensive and not too cheap by any means. I've used more expensive Numark's, that dont even compare in quality to the Gemini's.
With a 5gram tone arm, and a magnetic under plate im surprised they can sell these for less than $500. I definately suggest buying these if your relatively new to the art of turntablism

I bought this turntable to replace an older technics SL 1200 that had seen it's day. I didn't really want to spend a lot of money on another technics. As a DJ mixing deck, I would give the tt04 a 4/5. It performs very well. The only problem I see is that the ultra high torque (5.1 kg) makes it difficult to make adjustments in the mix. If you normally speed up and slow down your vinyl by manipulating the platter or placing your finger on the label of the record, it takes some getting used to, as it takes a lot of force to get the platter to slow down. As a scratch deck this one gets 5/5 for the high torque and the straight tone arm. It starts and stops on a dime, and the start stop times are adjustable. I also use the reverse function a lot for effects and the +/- 20% pitch comes in handy too.
If you are looking for the best bang for your buck, I would go with this deck. At the price I found it on amazon you can't beat the value. If you are thinking about just starting to DJ this deck will last you several years unlike the more inexpensive decks that will be useless to you after 5 or 6 months. If you are already and experienced DJ this deck will certainly do fine. Gemini used to be the slum of the DJ equipment market but I am truly impressed by this turntable. Unbeatable for the price.