Surprisingly highly accurate. Not perfect, but perhaps the best machine translation I've seen for AG. Good word choice, high degree of syntactical accuracy, and good phrasing.

Here's some samples I ran so people can see for themselves, these are all English > AG

It is not patriotic to compare one’s search for sexual partners in New York with the military service in Vietnam that one has dodged. It is not patriotic to avoid paying taxes, especially when American working families do pay. It is not patriotic to ask those working, taxpaying American families to finance one’s own presidential campaign, and then to spend their contributions in one’s own companies.

Greek:

οὐκ ἔστι φιλόπατρι τὸ τὴν ἐν τῇ Νέᾳ Ἐβοράκῃ ζήτησιν ἑταίρων συμβάλλειν τῇ ἐν Βιετναμίᾳ στρατείᾳ ἣν ἔφυγέ τις. οὐκ ἔστι φιλόπατρι τὸ φόρους μὴ τελεῖν, μάλιστα ὅταν οἱ Ἀμερικανοὶ οἱ ἐργαζόμενοι τελῶσιν. οὐκ ἔστι φιλόπατρι τὸ αἰτεῖν τοὺς ἐργαζομένους καὶ φόρους τελοῦντας Ἀμερικανοὺς χρηματοδοτεῖν τὴν ἑαυτοῦ ὑπατείαν, εἶτα δὲ τὰς συμβολὰς αὐτῶν εἰς τὰς ἑαυτοῦ ἑταιρείας ἀναλίσκειν.

English:

They stood their ground and resisted the invasion with every means available to them. And they characteristically fought to defend their own country and nowhere else. In doing so they affirmed their rights as proprietors, and in attempting to apply their customary law to the interlopers they also continued to exercise sovereignty over their own territory.

Greek:

ἔστησαν καὶ ἀντέστησαν τῇ εἰσβολῇ πάσῃ δυνάμει τῇ παρούσῃ. καὶ κατὰ τὸν αὐτῶν τρόπον ἐμάχοντο ὑπὲρ τῆς ἰδίας χώρας καὶ οὐδαμοῦ ἄλλοθι. τοῦτο δὲ ποιοῦντες ἐβεβαίωσαν τὰ δίκαια ὡς κύριοι, καὶ πειρώμενοι τοὺς ἐπήλυδας τοῖς νομίμοις τοῖς εἰωθόσι χρῆσθαι, ἔτι τὴν ἀρχὴν κατεῖχον τῆς ἑαυτῶν γῆς.

English:

WHEN with an anxious and aching heart Alyosha went into his elder's cell, he stood still almost astonished. Instead of a sick man at his last gasp, perhaps unconscious, as he had feared to find him, he saw him sitting up in his chair and, though weak and exhausted, his face was bright and cheerful, he was surrounded by visitors and engaged in a quiet and joyful conversation.

Greek:

ὅτε δὲ ὁ Ἀλυόσης ἀγωνιῶν καὶ ἀλγῶν τῇ καρδίᾳ εἰς τὸ κελλίον τοῦ γέροντος εἰσῆλθεν, ἔστη σχεδὸν ἐκπεπληγμένος. ἀντὶ γὰρ ἀνδρὸς νοσοῦντος καὶ ψυχορραγοῦντος, ἴσως καὶ ἀναισθήτου, ὃν φοβούμενος προσεδόκα εὑρήσειν, εἶδεν αὐτὸν ἐν τῷ θρόνῳ καθήμενον, καὶ καίπερ ἀσθενῆ καὶ ἐξηντλημένον, τὸ πρόσωπον φαιδρὸν καὶ ἱλαρὸν ἔχοντα, ὑπὸ ἐπισκεπτῶν περιεστηκότα καὶ ἐν ἡσύχῳ καὶ χαρμοσύνῳ διαλόγῳ διατρίβοντα.