switch from a 5.25 percent loan to 4.25 percent

I currently have a 15 yr fix loan at 5.25% that I just switched from a 30 yr fix at 6.25%. My closing cost to make the change the change at my bank was $600. I now find out that another credit union that I do not bank at has a 15 yr @ 4.25% with a closing cost of $1000. I currently have $130,000 left on the loan. Is it worth making the change and doing the additional paperwork and run around for the lower rate. Or should I wait for something lower???