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I was told the same exact story. I even visited multiple independent mechanics and all were hesitant to work with Targa roofs. In reality, most of them just heard the 'stories' and recite them. They are not that complicated, and actually you can even find parts for them (although i haven't looked for parts for some time as mine's been working fine). What i ended up doing is rolling up my sleeves and doing the work myself. As long as you careful around motors and put markings of things when you disassemble, it's totally doable. Not super easy, but doable. The most difficult part is actually when motors get out of sync to re-sync them. Sunshade, if you can find one is fairly straight forward.