What makes this card particularly valuable is the 3X points on meals. If you eat out a lot or travel for business, this can add up fast!
I for one think SQ redemptions are great. 90-100K points for long-haul First Class is still better than United's partner redemptions, though not quite as good as
AA.
I like the ability to transfer Amex, Chase, and now Citi points into one SQ account and book it. Essentially combining the powers of the 3 cards you get 3X points on airfare (Amex gold), 2X groceries (Amex gold), 5X on office supplies (Chase Ink), 2X Gas (Amex Gold and Chase Ink), 3X Dining and enterntainment (Citi).
This means you can now get 2X-5X SQ points on almost everything you do! That is way better earning potential than the Citi AA cards.