In the classified section you have the ability to narrow your search- so you pick you items of interest on the left hand select and the page refreshes for every item over and over again. I am not a computer programmer or a software engineer but this is awkward. I hate to use other web sites as reference but simplicity is the key to searching for what you want..
taking a page from flying giants format and layout for their web design I believe you would be moving in the right direction. [ sorry ]
I hope you can fix these and other issues so we can enjoy R/C universe as we have in the past.