I fell for the sales a few years ago and did regret it. I have spent WAY too much money hoarding their plugins, believing I did save a lot of money. The plugins are fine, but the bad awakening happened when I realized you have to pay them quite the sum of money to keep the plugins up to date. Whenever they decide to increase the major version, you’ll have a bad time either way. Mixing older and newer versions is kinda bad, because old versions might not support the latest MacOS, and getting them upgraded every year or so is rather expensive and honestly… not worth that much money. The plugins are fine, but not THAT great. There are a few exceptionally good and unique ones, though. I keep those up to date only. For me, that would be their Nx, which I also bought the bluetooth tracker for and the PuigTec EQs, as well as the API 2500 compressor.
However, in hindsight, I feel kinda scammed, because of course they don’t really tell you the update costs in advance when you get drawn into the sales, which they keep up almost all the time. I don’t like their marketing strategy.
And then… there is another point. After I had some projects I could not load anymore, because I didn’t have the plugins installed anymore or after my switch to Mac, I had no more access to my Windows-only plugins, I decided I would make much more use of plugins that came with my DAWs. Just to make projects future proof and portable. And honestly… that is the better choice. Saves you much more money, CPU time and frustration.
Given my experience with Waves, I can not recommend their products, as long as they don’t change their marketing and pricing strategy.