I've done IF in the past and I find it a pretty ideal solution. I think it is easier if you have a history of exercising a lot - enough to deplete your glycogen reserves - because this will train your body to utilize your fat stores more readily. I find that when I do IF, I might feel a bit peckish in the early afternoon, and then in the early evening I am quite hungry and eat dinner. I feel like it isn't a big deal, and one of the big benefits is learning to experience the sensation of hunger and accept it, rather than thinking it is an emergency.

Here are some links. They do say more long term study is needed, but they also say that there are increased negative effects from its consumption. Occasional one off consumption is probably maybe safe, regular consumption is certainly indicated to not be safe. Just like regularly eating too much salt or sugar isn't safe. You do you though, eat what you want.

Cleveland clinic study

Oxford Journal

University of Colorado Study