I've used standard consumer - level trimmers forever, and they were adequate, but these are infinitely better. The motor is much stronger and the blades cut very evenly, which cheaper trimmers cannot do. Also, the small size makes them easy to handle, especially when trimming facial hair, which is my main use for them. The cost is very low for what is essentially a professional quality tool. I bought the corded version, which, I gather from research, has a more powerful motor than the cordless.
They are great and I recommend them highly!