The stock bit is great. They are just aluminum cutting endmills and work great for wood. A few things I would like to know:
1) What material are you cutting? If wood, what types and grain direction?
2) What speed is the spindle?
3) What is the depth of cut relative to bit?
4) What is the feed speed (on auto and how fast are you pushing it?)
5) Do the bits show burning and discoloration?
6) Do you clean your bits?
7) What are you using for dust extraction? (CRITICAL)
I have used stock Origin bits, cheap SpeTool bits from AMZN (I like), high end aluminum cutting bits (hand me down from friend who is prototype machinist), Freud, Diablo, and expensive Amana Spektra coated bits to name a few. Bits should last fairly long as you treat them well. Push them too hard or fast, you'll dull them quickly no matter what. Keep em clean and they'll last a little longer and cut cleaner. I started using CMT 2050 recently and a little goes a long way with a little stainless or brass brush. The Spektra do offer a longer life at a premium price.
One other thing is if you are using the shelf and cutting through tape, you've gotta clean that tape off EVERY TIME you cut through it.
FYI, the forums at
http://community.shapertools.com are also a good place to get info. I'm there, same name
I burned up my first stock Shaper bit pretty good. Then again I was doing a lot of baltic birch and it is pretty rough on edges.
I will also add that the Diablo bits you can get for $26 (up $4) are really quite good for the value and availability. Especially with baltic birch.
https://www.homedepot.com/p/DIABLO-1-4-in-x-1-in-Carbide-Up-Spiral-Router-Bit-DR75102/100660697