Gaucho definitely make the very best sausages in the city - the taste is remarkably superior to other shops. I usually buy the hot italian sausages and the their breakfast links. (on a side note - try out their potato salad - it is amazing!)
The owner's daughter, Krissy - I agree is very helpful and knowledgeable. I have tried sausages from other stalls at SLM but no point, they do not even compare to gaucho sausages.
Tried the following:
Tuscany with anchovies and tomatoes
Spicy lamb with red wine
French with champagne
Merguez North African Lamb
Red Hot Chorizos
They were all delicious! My favourite was the Merguez and then a tie between spicy lamb and red hot chorizos. Tuscany was delicious and French was a nice mild sausage. I loved them all, plus they have a hot table for lunch!
I may have been served by the owner's daughter as well, not entirely sure. Either way, super friendly and knowledgeable and made it a pleasant experience :)