Hi Gus,
Oh yes, those two were among my first ones I ordered over a year ago (after Neps of Borneo/Neps of Sabah). These above were just cheaper books of theirs that I was eyeballing and waiting to order until this Neps of Sarawak book came out. I still want the Phasmids of Borneo, Dragonflies of Borneo and Birds of Borneo (the big one not the pocket guide) but those pricer tomes will have to wait a bit.
As far as my selection goes, I like good reference books on just about any nature related subject and of all the books I scour at the book shops theirs are almost always top notch when they arrive. The Stick and Leaf Insects of Singapore book they have was really disappointing and the only book of theirs I sold almost immediately. It was almost entirely B/W line art and not too good art. All their other titles I have are chock full of great text and images. The best book I have from NHP (asside from the strick Nepenthes related titles) is National Parks of Sarawak which is a huge volume and has tons of info on the climate, geology, land forms, rivers, lakes, natives, plants, animals, etc in the park lands around Sarawak.