There is nothing wrong with subscription based service...but when you switch the company should be polite to long-term customers and have some real answers.
Here was my review of the service on MacUpdate:
19 September 2019
I rate DG5 five stars before it lost support to monitor Time Machine Hard Drive, however... I am getting ads for DG6. First I'd like to say DG has saved me heartache several times with my iMac HD and externals failing when Techtool Pro didn't find anything. For $85.00 they are offering a yearly subscription which is bound to be higher if I don't grandfather in. Now the bad side: DG can NOT monitor Time Machine anymore. Customer Service can not tell me when and if they will rectify this. No warning was given customers when this happened and it slowed my iMac to a crawl and took me days to discover that DG was the culprit. I told them if you can let me know that DG6 is available you certainly could let customers know when something becomes deprecated in DG5. I have to turn off ALL external drives (8 including Time Machine) from monitoring and Prosoft had no answer as to whether or not they would allow us to turn off drives individually in the future. I asked: When DG6 subscription becomes public will there eventually only be support for the subscription model (yes, is the answer)? Their answer was "There is no further information at this time. More will be known upon the official release of version 6." Really unconcerned (or uninformed) support and yet DG5 has been the best protection I've had so far. However, without the ability to monitor my external HD's I don't think I can upgrade to DG6.
___
And others:
https://www.macupdate.com/app/mac/17099/drive-genius/reviews
___
I gladly pay a subscription for Sibelius, my music composition program, but they grandfathered in customers with a 3-yr cheaper subscription, were POLITE, and had answers.
I will try contacting Prosoft again because frankly, their drive pulse save my a__ a couple of times. (I have 8 external drives.)
I will look for alternatives though, even subscription based.