At the end of the day they’ll be giving you shares, not dollars. It’s better to think of it as them giving you shares, not thinking about the current cash value, since the cash value will change over time.
So if you get 4000 RSUs over a 4 year period, vesting every quarter with a 1 year cliff, that means after the first year you’ll suddenly have 1000 shares in your account, some of them will be sold off for taxes, leaving you with a pile of shares that you can keep or sell. Then every quarter you’d get another 250 granted, minus the ones sold for taxes again.
The other thing to keep in mind is that this is something you can negotiate, since the company may be able to be flexible on some of the terms. I wish I had realized that earlier, since I had been working as a contractor with them for almost a year before I was hired, so I may have been able to argue for backdating the vesting schedule for example.