I think the point goofy4tink was making is that commercial air service to Lakeland Linder Airport is very new and very limited. Perhaps goofy4tink has seen a few reports here with actual experiences flying into Lakeland, but I haven't noticed any such reports myself. I also haven't seen any reports from people with experience renting cars from either Hertz or U-Save at Lakeland Linder Airport.
I've never used U-Save anywhere. According to their website, U-Save has been around since 1979. Looking further at their website, their growth has been driven by selling franchises to local operators.
The Lakeland franchise has its own website. According to their "About Us" page at
http://www.usavelakeland.com/about-us/ they've only been in business since June 23, 2011.
I'm not saying they're good or bad. I am saying they're very new.
Presumably they're betting on the success of DirectAir at Lakeland.