I'd seen a lot of people talk about how much work they had to do these machines to make them reliable. Out of the box it worked pretty well. The only adjustment I had to make was to the wedge that the original key rides on. I moved it back by maybe 1/16th of an inch. After that this thing made perfect keys. I've used it to copy Kwikset style keys for my home and work, and to copy keys for my F150. Cutting two truck keys covered the cost of the machine - since the old hardware store closed no one will cut keys for my vehicle now, other than a local dealer wanting $150 a key.One complaint, but I won't knock a star for it. I ordered the 120w version. Comparing prices to other sellers on Amazon, I think the seller mixed up pricing between the 100w and 120w versions. I ended up receiving a 100w version despite this. I decided not to sweat it, I'm not sure how an extra 20 watts would make a difference. The wheel cuts the keys just fine, and the automatic movement on the slide has no issues either. I'd say that the 100w version is probably the sweet spot if you're getting one of these to save money rather than use it as an investment for business purposes.