Visa Stamping from Canada/ Mexico

I got h1b stamping from ottawa.
I am working in EVC models. Working in US for past 12 years. Working for the same client since last visa.

Appointment on June 26th 9:00 AM,
Out side the lady checked the ds-160 and scanned and sent it inside.
Inside one lady took my Passports and DS 160 confirmation pages and I797 asked few questions:
1. how long you are working in US
2. Is this your employer (named my employer)
Then sent inside
After security scan
Was in line for 15 min,
Then went to counter 7 for finger prints and she asked these questions
1. When did you come to canada
   me: day before yesterday
2. Are you applying for the same visa?
   Me: Yes
3. Then she asked my old passports for old stamped visa
  Me: gave her old passports
Then she asked me to go for interview counter

Went to counter 2 ( gentleman)
VO: Whom you work for
ME:xyz
VO: how long you work for them
ME: xx years
VO: ho thats long time..
VO: Where do you work? (Client location/employer)
Me: Client
VO: Who is your client
Me: ABC...
VO: Can i have offer letter from your employer?
ME: gave him
VO: Do you have any document from your client?
Me: Gave him client letter?
VO: What you do at client place?
Me: ^&%!^%^$%!$!&%!&
VO checked for some time then asked my last year W2
Then checked something for 3 min or so then said your Visa is approved.

Hence if you have all proper documentation and required docs, You donot have any issues.
Good luck guys.