I've been to Tender several times and so I've seen it change since it's opened. I really didn't like it much at first- too pretentious. But they've significantly improved their host staff, which really helps the overall experience. The servers are very knowledgable and helpful, without being pushy or intrusive. And the bartenders are some of the best in the city. I can always count on getting a cocktail that's exactly what I want after talking with the bartender about my taste preferences. The staff all really cares about what they do and genuinely want the patrons to enjoy themselves.
The food is very good, though it can be a bit pricey. I tend to order some of the cheaper menu items and really like them. The brussel sprouts and potato skins are soooo tasty. The burger is one of the best in the city. And they recently put a pulled pork sandwich on the menu- amazing sandwich and only $9 for what is easily 2 meals for me. So, while it can be really pricey here, there are ways to make that better.
Finally, the ambiance is great. They often have fun live music playing. The background music when the staff sets the playlist is fun without being too hip or pretentious. I like that they've opened up the lounge space so it's easier to get seated when they're crowded.