You will want to keep things simple at first. I'm not familiar with the Discovery myself, but did start out with a Bounty Hunter Tracker 4. I found the X-Terra 30 (which has now been replaced by the 305 now) to be a much easier machine to use. Mostly because it has visual information on the screen. I assume that the Discovery would have that. The pinpoint feature is a big help at locating targets. This feature won't be on you detector.
There is nothing wrong with the Discovery. Like another poster said, if you want to learn how to get the best out of it, just pop over to the Bounty hunter forum (which is further down the page) and you will find some pretty happy Bounty hunters users there that can give you some real good pointers on how to use it.
Detecting is not really about having the "best detector" in your hands, but knowing how to get the best out of your detector that you own. A guy with a simple detector and knows it inside and out will usually outperform an average detectorist that has a top end machine but is inexperienced with it.
It comes down to budget concerns and what your personal preferences are. They all find the goods. It just a matter of what sort of tones that you want to listen to, and what sort if any visual information you want to have. Visual information is only good as a ball park idea of what you are going over. In ideal conditions, it will be spot on, but is often inaccurate if there is nearby junk eta.
If you are happy with the Discovery, then stick with it, if you want something that is easier to use, then the 305 is a good choice. You don't need to spend mega bucks to have a lot of fun. The 305 will hold it's own very nicely even compared to it bigger brother, the 705.
Mick Evans.