I just bought the Silverstar Zxe today and install was easy. It's whiter and brighter than the stock bulb and there is an improvement, I'm satisfied and I like it but of course for people who's gonna compare it, it is nowhere HID quality. I don't want to go with HID route cause of the cost and the hassle of installation, wiring and kit, electrical stuff, guess I'm kinda scared lol and I don't have the budget.
Based on my research this should last a year for a $60, hopefully I can use the warranty when it goes bad. There is also the "HOD" from AAC and probably whiter and brighter than Silverstar Zxe but I heard not-so-good reviews about it.
Overall, it's always an improvement to stock. BTW, I have the 3.6 so I'm not sure what's my stock bulb difference to hemis. Cheers!