I was in your position two years ago. It was my experience that schools almost exclusively look to class rank when you transfer. I didn't get into any of my top schools (grades were fair and LSAT was not that impressive), but got accepted to all of them as a transfer student based on my class rank.
One top tier school (Washington University) said if you are in the top 1/3, they take you. Other schools can't accept that many transfers, but again, they don't look much at LSAT or undergrad grades.
The only downside is that you usually aren't eligible for financial aid your first year as a transfer student. If you do well, you may be eligible for your 3L year, but probably not for your 2L year.
If you want to transfer because you are sure it will get you a better job, then do. If you want to transfer because you want a better experience--don't. You suffer through hell together with your 1L friends and you become very close. There will not be that closeness as a transfer student, because you did not go through that with them as a 1L.
I got a connection to get a better job because of the law school I transferred to, so it worked out well. But, I must say the experience was not nearly as fun as my first year, just because I never got as close to the people here in two years as I did in 1 year as a 1L at my previous school.
Just something to think about!