Proviron has MILD anti E properties. It will not replace an AI like adex or aromasin. The main point of proviron is to free up more androgens. It allows you to utilize the other compounds better by occupying shbg so it can't attach to the other compounds. It's a cycle enhancer with very mild anti E properties. Depending on how rapidly you aromatize, proviron may be enough to manage e2 on trt, but certainly not on cycle.
It also had androgenic effects such as increase in libido and feeling of well being. Naturally, DHT is the hormone mostly responsible for sex drive, libido, and it aids in mood improvement. Proviron is a DHT based steroid which is why it mimics these effects.