I have 2 cameos a 2 and a 3, and I find them to be very accurate and have had no problems fulfilling mass orders on them. Cutting 120 logos at a time (using cutting mats), many with small lettering and fine details. I clean the blade often and err on the side of caution when setting a cut depth and speed/force for the first time, to avoid damaging the blade.

As I've seen further up the thread, you do need to adjust your settings as the blade gets worn, but it's only gradually. I make sure I always have new cutting mats available too, got 3 x 12" by 12" for £8.99 the other day from ebay. Completely the same as the official cutting mat. Also use a 36 x 12 for larger jobs.

I find that if you stick down your vinyl well, no lumps or bumps, keep your blade sharp and clean, and ramp up your settings gradually, also do a couple of test cuts to get the blade working, then you shouldn't have many issues.

Make sure the blade is suitable for the material you are trying to cut too.