<p>I have owned my D700 for about five years now, and it's gotten a lot of use in that time. I just sent it in to APS for cleaning and maintenance. They're recommending that I have the following things done:</p> <ul> <li><strong>Replace the Mirror Box Sequence Unit</strong>. Apparently, the gears that move the shutter are pretty worn. This maybe the reason why the shutter mechanism freezes up in extremely cold weather, something I started experiencing a year ago.</li> </ul> <ul> <li><strong>Clean the inside of the Pentaprism</strong>. There's quite a bit of dust and debris that's gotten in there. This is obviously not an essential repair, but given that the camera will be disassembled for the replacement of the Mirror Box it's cost-effective.</li> </ul> <ul> <li><strong>Replace the left-side (rubber) grip</strong>, which is starting to peel off near the Focus Selector Switch.</li> </ul> <ul> <li><strong>Regular cleaning, including the sensor.</strong></li> </ul> <p>The total bill comes to $645.<br /> the D700 has been my only camera up to now, but that's about to change. I am considering purchasing another body, either a D750 or Fujifilm X-T1. I might just end up selling the D700. For now, though, I am going to keep it around as a second body. <br /> So, what I am wondering is if it's worth spending all that money in getting the D700 in top shape. Is this a good investment, regardless if I keep it or sell it down the road?<br /> Any feedback would be greatly appreciated. Thank you!</p>