Is Laserlyte good boresighter ?

I'm planning to purchase this a href="http://www.amazon.com/gp/product/B004R56XM8/ref=pd_lpo_k2_dp_sr_2?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B000GU9M6M&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=16MJ0ST8H20K7WH6QMXS" rel="nofollow"http://www.amazon.com/gp/product/B004R56…/a Boresighter. Did anyone ever used it ? How is the performance ?