introduction and tool box question

[Toolstang86]

Hello, I am new to the forum and my first post. I know there is a lot of discussion on tool box quality and price. After reading several posts about Harbor freight boxes compared to the truck boxes, this topic seems to get heated at times, so I just have a question about drawer slides. In my opinion a Snap on box or similar truck box is of great quality and I would love to own one. However I am not a pro and the cost factor is huge. As a gift I received the harbor freight 56" top and bottom box. As many stated here the bottom seems to be better quality than the top. I noticed the slides on the top box are different. My question, are there better ball bearing slides out there that I can replace in the top box? If so What would you guys recommend, I believe they are 19" slides. Has any one else with these boxes notice a slight dip when pulled all the way out. The drawers are in no way overloaded. Thanks in advance for any suggestions.