This item can be useful early on to help followers meet the requirements for new weapons. While the Increased Chance of Blocking is largely wasted in this use case, the Increased Attack Speed and Faster Hit Recovery found on the armor can help a follower reach more favorable breakpoints.
The 25% Increased Chance of Blocking found on this armor is best-in-slot, beating out Guardian Angel by 5%. For a character seeking maximum block chance, this bonus can constructively provide hundreds of life due to the dramatically reduced Dexterity requirement needed to maintain a 75% chance to block.
To illustrate, let us consider an Amazon wielding a SpiritMonarch. Typically, a clvl 85 Amazon would need 287 Dexterity to maintain a 75% chance to block. However, the same Amazon wearing Twitchthroe would only need 193 Dexterity to achieve the same result. Taking into account that each point in Vitality provides the Amazon with 3 life, the 25% Increased Chance of Blocking combined with the +10 Dexterity featured on the armor constructively amount to a "+312 to Life" modifier.
If your Act 2 Merc is using Twitchthroe (which is one of the better low level armors for damage), Merc may use an Ethereal Battle ScytheInsight on level 27 (an Ethereal BillInsight can be used on Level 27 without any Str/Dex bonus)
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Squelches this trader, making their offers on your trades invisible to anyone except themselves. Their trade listings will also be hidden from your marketplace.
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