RCA to HDMI Upscaler Converter

[sm19422]

I finally purchased a new 40"HD TV.

I can play my Toshiba Vcr through the coax and a/v connections on my new tv.
The vcr tapes do not have a very sharp picture.
Would a RCA to HDMI upscale converter improve the sharpness of my old vcr tapes?
Amazon has quite a few of them for sale.
https://www.amazon.com/Svideo-Conver...a-569349346534

https://www.amazon.com/dp/B01L8GG6PW...B0769GMV9YDoes
Does any forum member have any experience with this type of device?
I do not want to waste my money purchasing a device like this unless it improves the picture quality of my vcr tapes.