I have really mixed emotions about Sack's.
On one hand, the baguette bread is soft and chewy; the sandwiches are creative (my coworkers both really like the Jazz and the Gothic); if you don't see a sandwich on the menu you want you can create your own; they use spicy brown mustard (yummy!); the caesar salad is good; service is quick; and you get a cookie with all sandwiches and salad.
On the other hand, it gets really crowded if you don't get there by 11:30 am or arrive after 12:45 pm; the parking lot is super small, so you typically have to park at First Watch; there is a sign that drink refills are for the large size only (I have ignored that sign as I find it ridiculous that they could actually monitor who refills and doesn't); it gets very very noisy so it is hard to hear the people sitting at your own table; and I think the price is a bit high for a sandwich shop (about $9 for an 8 inch sandwich, chips and a regular soda which apparently I can't refill).
Sacks is nice occasionally, but I hate to admit, when I am really craving a sandwich or sub, I usually run to Subway where I can get a meal for almost half the price of Sacks.