Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: What is the difference between this and the Apex 1?
Document: This will compensate for the difference in thicknesses and maintain your desired angle.Two hundred dollars was a lot of money to spend on a manual sharpener. The thought of doing so made me nervous. After buying it,I even fought off a bit of buyer's remorse. However, that dissipated with use and the resulting edges I achieved using it.
For regular knives this will be perfect...but for fillet knives it is not the system to buy.Edge Pro Apex 4 Knife Sharpener
When usps couldn't deliver this package, the guys at edge pro contacted me and helped me get it to the right address. They used a lot of time and even called usps. Now I have my edge pro apex 4 and I'm loving it!
This was one of the best investments I have ever made! The instruction video makes using the apex simple, even for the first time! I'm a professional chef, and knives are expensive. Having the apex saves me time and money, while keeping my knives razor sharp.
I was turned onto the EP Apex through a number of reviews while looking for a solution to my ever-dulling knives. I had purchased nice knives, but they were unable to keep the kind of edge I was expecting. What should have been excellent knives ended up being simply average knives because the edge was not up to par.
).It's very easy to use, very efficient, and very expensive. The cost was definitely a hurdle for me to get over, but after seeing the kind of edge it will put on even my cheaper knives, let alone my harder steels, I would buy it again in a heartbeat. There may be better systems out there, but I will never know about them, because I am perfectly content with using this system from here on out. I would recommend the EP Apex to anyone. Period.
Is this expensive? Yes it is. Is it worth it? I believe so. I admit I am obsessed with keeping a keen working edge on my knives. If you use knives often or are obessive like me, then the Edge Pro Apex is worth the money. I love the system. There is a short learning curve of about two medium sized knives, then you really start getting down to business.Pros: It is a great design. The stones cut well and clean easily.
I'm very well pleased with my purchase. It took me awhile to get use to it , but it works very well. I was going to buy a Lansky but the reviews made me look in another direction. I owned a Lansky about 30 years ago and liked it. The new reviews on the Lansky said the quality isn't there anymore , so I looked on youtube and saw the EDge Pro Apex 4 Knife Sharpener. This is absolutly the best knife sharpener out there for the money.
For my purposes I need and really sharp edge but it doesn't need a mirror finish. I take it up to the 1000 grit and finish with the 1200 ceramic rod. It makes it as sharp as I will ever need. Lastly don't buy this if you want to sharpen fillet knives. The flexibilty of the blade will not give you a good edge.Overall I am not experiencing any buyer's remorse with the Edge Pro Apex. I believe it is worth the price to have stupidly sharp blades. Would recommend.
When your friends start asking you to sharpen the butter knife they 've been carrying, you're getting pretty good. Patience and watching the videos by Edge Pro is all it takes.
Answer: The Apex 4 has several more sharpening stones. The Apex 1 comes with only 2 while the Apex 4 has 5 stones up to 1000 grit and polishing stones for the very fine detail. It also comes with an instructional DVD and a ceramic sharpening rod. Most definitely worth the extra money if you have several knives to keep sharp. I've done my kitchen knives and all the outdoor knives that our family uses.