I'm glad there's a discussion on my favourite prayer book. Let me explain why it is.
Coming from a Latin rite familiarity with the Divine Office/ Liturgy of the Hours, I've always assumed it is possible to read the Office privately, but it doesn't apply to the Eastern rites. First, the Eastern Rite offices, as liturgy should be, are public prayer. Furthermore, in Orthodox Vespers and Matins (Orthros) particularly, as liturgies should be, are not about praying texts, but performing liturgical offices. Personal prayers using the texts of the Orthodox Byzantine prayers would be an exercise of a spiritual discipline, in following a personal prayer rule. And in the Byzantine tradition, the simplicity of the Third, Sixth, Ninth hours lend themselves easily as an anthology of prayers for a personal prayer rule. Personally, my liturgical sensibility would also consider private recitation of the Liturgy of the Hours also a kind of a personal spiritual discipline.
That said, as a Latin rite Catholic, I want to pray the 'real thing' of Lauds and Vespers as hinges of the day. 'Let us Pray to the Lord' allows for this, because unlike the other Byzantine prayer books, it includes these two 'hinges' during the sunset and sunrise.
That said, Let us Pray to the Lord is a pared down version of the Byzantine Office. What you will not find are the 'propers' for celebrating the feast days, the seasons and the saints (the Menaion). Though they provide a very good selection of the Sunday hymns from the Octoechos. Neither does it include the full psalter. So you might find yourself somewhat short-changed, feeling you are not getting the whole deal. But I think this editorial decision is wise and I will explain why.
There are slightly fuller versions which provide these seasonal, festal and memorial material. The material for New Skete is excellent, but they cover several volumes of book. The Melkite Eparchy's Horologion and the St. Josaphat Eparchy's Divine Office provide fuller selections of these material in single volumes. But in practice, praying these texts take a long time and you will find yourself trying to abbreviate to actually sustain a manageable discipline of prayer.
"Let us Pray to the Lord" abbreviates these prayer texts in very liturgical sound way. And if you want to augment this short prayer book with these additional material for free, you can sign up here: http://ecpubs.com/product-category/subscription_electronic/
for these texts to be electronically distributed by email. Jack seems to be running this ministry on his own — I don't know how he manages it — so it will be decent to subscribe for this service with the monthly stipend of $5 option.
I have a question for Jack: are there any parish or monastic communities using "Let us Pray to the Lord"? It is a well-thought revision of the Byzantine Divine Office but Eastern rites folks are so resistant to liturgical changes!