Synergy ROM is fantastic ROM that comes with great features. The most notable one is the multi-window that works great out of the box!
I have had some network issues using this ROM with my T-Mobile Galaxy S3 and I would assume with the AT&T variant too.
You will probably experience network issues too, if you have a GSM Galaxy S3 variant, because this ROM was ported from a Verizon Galaxy S3 variant.
Even if you don't use this as a daily driver this is a great ROM just to experience different features for the weekend.
Try out this ROM using the link below!
Download Synergy ROM for Galaxy S3 T-Mobile/AT&T/Verizon/Sprint
Credits - XDA
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