The Thunderbird is definitely one of those discs that I hate to imagine playing a round without. It's a disc that I can pull out for so many different shots. Really, no matter what I'm faced with on the course, I will have some confidence if I have a Thunderbird in my hand.
One of the situations where the Thunderbird really excels is with those pesky tunnel shots. If I am faced with one I have complete faith in this disc. I know that if I release my Thunderbird flat at full power that I can count on it to give me long, straight RHBH shots, that finish with a super predictable, soft little baby fade finish.
While the Thunderbird is great with tunnel shots, I think it is at its best when used for hyzer approach shots. That is where it really shines. If I have anything in the 150-275' range that has any sort of hyzer line, I either throw the Thunderbird or I consider throwing it. I can't think of a single shot in my bag that I have more confidence in than a RHBH Thunderbird hyzer. It's the closest thing I've got to a sure thing. From spikes and low flighted skips to everything in between. Windy day? It makes no difference. The Thunderbird is the best wind disc that I have ever thrown.
While the Thunderbird is amazing when thrown BH, it is also fantastic at all of the forehand shots? Just about everything I can do well with the Thunderbird BH I can also do FH. It is the only sidearm control driver I trust. While I can obviously get more distance out of something like a PD or Destroyer, there is a tradeoff with those it regards to reliability and consistency that does not exist with the Thunderbird.
In addition to being the perfect disc for better disc golfers (just look at how many of the top players carry several in their bag), the Thunderbird is perfect for the more novice/beginning player. It is a disc that beginners will immediately find a use for, and then, as they develop, trust for more and more shots. Even if you're still only throwing your drives 225-250', the Thunderbird is something that will really improve your game. For those developing players, it can quickly fill a role in your bag as a reliable approach disc, as well as your go-to disc for skip shots, and windy days. It also will really give you a great tool to help you develop a FH shot.
So, if you're a beginner and you can chuck it out there anywhere in the 200-300 range, then I think your next disc purchase has to be a Thunderbird.
More specifically, a 166g Champion Thunderbird. You will be throwing DARTS with the thing on your approach shots in no time.