They have the same type of restrictions and penalties as well. You can't withdraw until you're 59.5 years old and you need to start taking minimum distributions when you're 70.5. The assets grow tax free, but are taxed when withdrawn since they went in pretax.
Rollover IRA can also be transferred to your current or future employer's retirement plan if you wish to consolidate it. I wouldn't recommend this though unless you gain some sort of economies of scale benefit.