Others have already laid out issues with cheap tools. Get this set, assuming you want capabilities for battery changing, band and strap changes, etc. It's very good quality from the biggest name in watchmaking tools.
If you plan to actually disassemble and reassemble movements that's another kettle of fish entirely.
Today I am selling my like-new Bergeron 7812 quick service toolbox. I ended up only using this toolbox once to resize my Omega Speedmaster bracelet. I have learned that I am not too much of a tinkerer, and thus it is best to sell this to someone who will get more use out of it.
I purchased this set from Amazon on December 2018. Quick description from the Amazon website:
"This 18 piece Bergeon quick service tool set is perfect for carrying out minor repairs on your watches. The tool kit is packaged in a hard plastic case with the inside cut out perfectly for each tool. The carry case is perfect for Travel and will hold the tools safely and securely while in storage or on the road. This tool kit will help any watch aficionado easily change batteries, change or shorten bracelets, etc. Each set is made in Switzerland of the highest quality materials available. The set includes the following Bergeon tools: 6460-P plastic tweezer, 7026-00 antimagnetic tweezer, 30081-100 1.0mm flat screwdriver, 30081-160 1.6mm flat screwdriver, 6767-s spring bar tool, 2510-n flat nose Plier, 7043 knife and case opener, 6789-g flexible wrist measuring band, 2819-mini JAXA mini case opener, 2611-2.5 2.5X watchmaker's loupe, 7039 100% microfiber cloth, 7230 pin extractor, 6899-m-100 1.0mm flat spare blade, 6899-m-160 1.6mm flat spare blade, 6767-a spare spring bar fork, 6767-b spare spring bar point, 7230-g08 spare pin, 30080-tn small Tube container. The tools are all made in Switzerland by Bergeon, the finest watch tool maker in the world."
The URL to the product is: https://www.amazon.com/Bergeon-Professional-Service-Repair-55-699/dp/B016A26IH0
As you'll see, it's listed for $239.57 on Amazon. I'm asking for $180 shipped within CONUS.