Gateway websites provided by SFI are absolutely adequate with their own spcifications. Having your own website is not that easy if you don't have web designing knowledge. But if you can design & manage, you can go for it with more advantages, like:
1. You can design it as you wish
2. You have full control of it & anytime you can change its look or whatever you want.
3. You can add any advertisement/referral anytime.