Combined with a Dark Staff, you'll have +11 hMP. That's still beat out by the Bastok/Sandy CP clubs that offer +7 hMP for citizens and the Legion Scutum with +5 hMP for a total of +12 hMP.
The Dark Staff is still useful outside of resting, so it becomes a question of whether or not the extra hMP is worth the inventory slots when deciding between staff+grip or club+shield.
Dark Staff + Grip + Cookie (wizard or ginger) + Sigil and we're talking about full MP in roughly 1-3 minutes of resting (depending on your mp pool). Best hMP gear for campaign obviously.