Has anyone tried either Superfeet insoles or the SOLE moldable insoles endorsed by Dean Karnazes for tennis? How long do they last? Do you think they're worth it? I know it's not a replacement for doctor prescribed orthotics, but I'm wondering how big a difference you notice if you use them? I'm looking for something that will provide a little more arch support and cushioning. What other alternatives would you recommend that you can notice a difference and are worth it?