air ride controller for 01 ls430 questions

i have the ls430 UL . i was interesting in getting an  air ride controller for it. anyone have any opinions on these things? i was wondering how many different types of brands are out there and which ones were best. plus, if anyone out there have a 01 ls430 with the air controller, let me know how it is!!  im new to this stuff. so anything about this will be helpful...thanks in advance fellas!!

Your Best Bet is to get the newer controller.......... ASC680
 
I have a new one here at the house if you want to go new.