I put Maya in daycare at 5 mths so that I could finish teh last semester of my degree, so she was there 30 hours a week. I originally intended to take her out of daycare once I finished studying.
But Maya loves daycare so much, that I kept her there. She now only goes 16 hours a week, and to start with I was just an at-home mum. Now I am working from home, so it is good to have her in daycare. Alos, as it is just her and I at home, it is good for her to have contact with other adults and kids.
Some of the benefits I have found are that she is very independent, she is self-assured, she is confident and she socialises well. She doesn't cry when I leave her, she just says "bye mama" and takes off.
The negatives I have found are that I miss out on seeing so many things eg. the first time she rolled over, also she has been sick more often than she might have been had she not been in daycare.
It is a very personal choice, but it works for us. I also dedicate all the time that she has at home to her, and I don't work when she's awake at home.
Good luck with your decision.
Mum to Maya Grace 02-03, Sienna & Mercedes 10-06