Is my free tier too generous?

I recently launched a screen recorder chrome extension and I would say the reception is pretty good, with quite a few installs already, but only one paid user. My pricing model is a LTD for $39 for Pro. The free has everything the pro: auto-zoom, unlimited recordings, webcam support. However the free exports come with a small watermark on top-right. The watermark is the website URL. My idea was that people who prefer not to buy the LTD can still use the product at the cost of "advertising" it...