Do yall know how fast this is in downloading mode. Thanks

DSL Ultra
Downstream/ Upstream
1.5 Mbps/ 256 Kbps

DSL Xtreme
Downstream/ Upstream
3 Mbps/ 384 Kbps

DSL Xtreme 6.0
Downstream/ Upstream
6 Mbps/ 512 Kbps

I want to know how fast these are and i want to know whats the best offer i should get ,thanks.