BW on SAP HANA - Questions

Hi experts,

i wanted to ask a few things aboutBW systems withHANA:

1) Afterthe migration to SAPHANADB (first upgrade frm 7.x to 7.3 SP5 anh then migrate to HANA), i can use DSOsand Cubesexistingwithout making any furtherchangesforimproving the performanceor do I needto first convert themto use thein-memory technology?

2) If i wanted touse thenative environmentof SAPHANAto createthe same objects(characteristics andkeyfigures) that have ina Cube, I have to createa new objectwith Visual Studio oris not necessary?

3) Whyshould I useVisualStudioand not continue tocreateobjects with theDWWorkbench?

Many thanks.

Charly