My first experience with Tarragon was about 5 years ago when my wife and I attended their special Valentine's Day dinner. We were disappointed on almost every aspect: food, service, ambiance, wine selection.
So we forced ourselves to pay them another vistit more recently, and we were very pleasantly surprised. They have apparently acquired themselves a new head chef, and the impact is obvious.
Every aspect of our food was good or better. They offer tasty buy healthy side dishes like garlic steamed spinach, the selection of appetizers was good but not esoteric or strange. The wine list was also much improved with some nice selections from Italy, France and Australia.
The service was very satisfactory, and the atmosphere was great. They feature live jazz every thursday evening, and if you select a seat near the back it can be very private and romantic.
If you've been disappointed by earlier visits, I recommend you give it another try.