Hey Mike,
I moved from a Tipple to an old style M&E, and though the Tipple was a great flute without much investment, I think the conical bore flutes are quite a bit easier to play (unless you have pretty large mits, most find Tipple D’s a stretch, but that you can get used to usually-unless your hands are small).
So, for that, I would say the conical bore is a step up in playability, and as Scott mentioned-that’s very important to many people. It’s just easier, so you play better. The embouchure is different too, in size and shape, and usually a deeper chimney too, unless like you, you ordered the Tipple with the lip plate. I didn’t have a lip plate on my Tipple, and it was a big difference going to a conical bore flute-but a good one.
Unless you need a Delrin instrument, I’d seriously consider a Casey Burns Folk Flute in Mopane wood. It’s still cheaper than the most popular Delrin flutes, and gives you a nice bonus-it’s wood! There’s nothing like a wooden flute in feel and tone, though I still like a good Delrin flute too.
Wood is easy enough to care for, so don’t worry about that. There are some guidelines to keep in mind with a wooden flute though, and if you’re up to being a little responsible about the care, they will do fine. Besides, if you keep your Tipple (many do), you will have a rough duty flute when you don’t want to risk your lovely wooden flute.
You will have to wait for it to be completed (Casey works in batches) see his webpage on them for the details. By the way, many have been very impressed with his Folk Flutes, and I’m not just referring to beginners! In my opinion, that’s a good step up. Here’s Casey’s webpage about them:
http://caseyburnsflutes.com/ff.php
PS Do a search, and you’ll see what people say about them. Good luck to you in your choice. Happy Trails!