I don't use the close shave thing on my neck. I use an old remington (ms2-300) like this
http://www.marbeck.com/app_images/remington_shaver_ms2-370_med.jpg which has a the thing that pops out (they call it a beard trimmer) takes care of my neck. Its close enough to look shaven but doesn't cut under the skin so its impossible to get razor burn. I do my neck every 2 days and my face every day. Trust me, Im very prone to it myself. Its old and doesn't even hold a charge but i hate razor burn and ingrown hairs and this combo works. I get maybe 1 ingrown hair every couple of months and its easy to manage when i do. The only reason i started using the braun was b/c it was a xmas gift from my ex. Actually, i liked the remington better so maybe i'll get the newer model haha.