I'm currently doing the timing chain on my son's 2005 Sport 2wd. It has 190K miles on it and had a pretty bad leak from the normal spot on the passenger side. Got it all torn apart and ready to clean up and reseal when I noticed the Tensioners on the small valve chains were either not functioning at all or had little to no tension. Main chain appears slightly stretched and decided that all this work would not be worth saving $250 in parts than to just go ahead and replace all the chain components now. No CEL on at this time. Difficulty was moderate to this point with appropriate tools, but also 4th gen appears to have more space to work with than my 5th gen.
Side note my 2010 also has 190k on it and has similar leak that is mainly seepage. However the Engine will need to be unboldted from engine mounts and lifted slightly to get access to the cover.... another degree of difficulty.