Early on online only probably a bit negative as I had little concept of the game, BRM, discipline, or tilt control. These days, mostly positive. There's a lot of commonality between themes in poker and in life and you can often apply what you learn in one to the other.
I do sometimes stay at the card room too long and then I'm groggy the next day. And if I feel myself getting cranky at the table (online or live) due to the action I'll get up for a few minutes.
So these days the biggest negative is being tired after staying at the table a bit too long. But overall I find my poker experiences positive, people socially are interested that I play, my SO supports me 100%, and I have a few friends I can play with or chat poker with sometimes as well. I find it funny that most of the interest in my poker playing comes with people who are fascinated by the concept of poker being played with money and how one manages (esp at live poker where for a lot of non poker players, $200 is a lot) the swings of winning or losing hundreds of dollars in a single hand. And those who play poker don't get how I can go from battling for an $800 pot at 1/2 live to playing as low as 1c/2c online