F5 Viprion question

1) If i plan to buy Viprion chassis does that means i should buy two chassis or just single chassis with multiple blade?

normally i see people adding more blades when they need more capacity and use 2nd chassis when they need high availability.

2) Related networking question does all blade should connect to switch as trunk? or just primary slot?

K15222: Use link-aggregated trunks for multi-bladed VIPRION systems

3) How does SSL TPS license work? is it based on chassis or license per blade?

viprion acts as one whole unit. so, i understand license is per chassis.

4) I am not seeing on internet people talking about viprion or any kind of review or experience does that means it's something people try to stay away? because of complexity?

every single service provider i have worked with uses viprion.