Did anyone try it? It looks like it a web frontend for rr, but the idea seems alien to me, especially the pricing part. A subscription for a number of submissions per month?! If there is anything you can't really plan, it is bugs, one month, you may need only one or two, the next it will be 50 in a day.
It’s more than merely a front–end for rr, because with rr you are still inspecting a single moment in time in your program. You can rewind to past moments any time you want, but that fundamental limitation remains. With Pernosco you are really querying a database that contains all the information about all the states your program was ever in. It’s a superpower that you can purchase.
I think the price is generally worth it, if you have at least a couple bugs to use it on every month. If you have more than 5 per month but don’t want to go up a tier, I believe you can pay “a la carte” just for the extras. If you have enough people, and you can afford the hardware to run it, I really recommend the on–premises installation.