I bought and installed the VG Sharkfinn. I tried three different times to install it, every single time there were gaps in the tape and I could never made them disappear completely. First two times I followed instructions (clean, dry, measure, tape, test fit, remove tape, press front part for 1 minute, press back for 1 minute, all set and done).
The third time (determined to get it to work) I got on a ladder and put all the weight of my body into the VG Sharkfinn, I could NEVER make the gap disappear. This last time was the best one (in terms of amount of gap). It initially looked completely sealed but gaps would come back 4-5 days later.
I am not badmouthing them AT ALL. They are stand up guys, very friendly, with good customer service and they stood 10000% behind their product. They helped me all along the way and made things right with me at the end. They even shipped me different sharkfins to try. I just couldn't get it right (even put a small dent in the window frame trying to put so much force into the finn).
The Finn is awesome, extremely pretty, but I just could never get it to fit. Maybe I am too picky and wanted 100% seal on the tape, I know some people who have gaps in the tape and don't mind. I was concerned with water getting in there, especially since the gap was in the front.
Just wanted to share my experience with the community, knowledge is power.