I think its always great to live near the blue line. Bucktown developed in the 90s because people were looking to an alternative to Lincoln Park/Lakeview to have access to the highways and the airport. Logan Square is the natural extension of that development now that Wicker Park is getting quite pricey.
As far as safety, agents are not supposed to make judgements about safety. What you can do is go to http://www.chicagocrime.org and search by address. It can be a little scary to see what goes on in your new neighborhood. Before you get to upset about it, check your current address and you may be suprised to find out what's going on where you live now.
I am bullish on Logan Square - I think that 10 years from now people will look back and say they should have bought in Logan Square when.....
If you are not already working with another agent, please feel free to call me at 773-244-1110 if you have any other questions. Best of luck!
Logan Square is growing and changing, though there is still plenty of room for growth and patience is required.
As for judging the safety of an area, there are pockets that are better and pockets that are worse. You can be your own best judge simply by exploring the area during different times of the day and night. Note the traffic, the activities, the noise level, etc. Although there are statistics that spout facts about demographics and criminal activity (that you can find in the link provided to you below in another post), "safety" is also about your own personal comfort level with an area. Nobody knows your comfort level better than you.