A friend of mine got this put on his wifes 98 4Runner. It's a nice alarm. The remote start has an impressive range too.... I'm just about sold on the whole thing.
I was quoted $550 also, that's an extra $50 for the bypass. However, it only comes with one remote for the alarm. At the shop near me, the standard remote is like $75 and the two-way is $125. You can find them on ebay much cheaper, and the shop will charge $10 to program it.