I really can't say strongly enough how much it's important to apply at least some of the firmware patches in the update fix; yep, for fairly light use, you won't have issues.
But anything beyond that, and you will start to run into some problems - particularly if you record a lot from ITV, where programme starts are very often signalled early.
Sixteen series may sound like a reasonable number, but you can get close to that quite easily, and the most annoying thing is that at present, it doesn't give you a warning that you're at the limit. You'll just notice because some timers fail to be set.
If you don't have the unofficial update, you'll probably miss a few too, regardless of the number of series links, because of a couple of other glitches in the EPG gathering, which are mostly sorted by the update pack.
I entirely agree that there are people who love to bash a particular brand, and Humax is getting a lot of stick over their freesat box, some of which is certainly exaggerated. More usually, I'm accused of underplaying any problems with Topfield boxes, but for all but pretty light use the 5.15 and 5.14 (that's Freeview Playback for the 5800) firmwares do have some issues that will cause people to miss recordings, unless you install the update pack.