Hi frogfish,
well, this operator, if we mean the same, advertises a lot.
In general, you have good chances to see ""everything"", ranging from Mola-Mola to Orcas, from Whales to Dugungs and huge schools of XX fish (replace XX with any name you want) around Alor.
BUT, and it's a bold
BUT: There's no guarantee!
What I can tell from my experience of many dives in different seasons around Alor is that you will nearly always see lots of Dolphins (at least on the surface, under water I wasn't lucky yet), tens, if not hundreds of jumping Thuna and/or Sail-Fish from the boat. Under water you have good chances to see schools of Thuna or Barracuda.
Sharks and rays are common, but you might have bad luck and don't see one for two weeks.
Regarding Mola-Mola: I once saw one on the surface but currents prevented me snorkling/diving with it.
Apart of that I can guarantee that the corals around Alor are still very intact with all it's inhabitants.
To get an impression of what to find (keep in mind that some photos needed 100s of dives around Alor to see that animal) have a look at the photos on
Tauchen in Alor. As well you will always have a chance to see something extraordinary around Alor.
Thomas made some photos of a water-python drowning a bat (
http://www.bdinet.de/pic_uw/1024/x087.html and
http://www.bdinet.de/pic_uw/1024/x088.html) or of a juvenile lion-fish (
http://www.bdinet.de/pic_uw/1024/x058.html). In case you wonder why I have the links: He asked in a german dive-forum about the name of the snake and linked the image there.
In short: Alor is definetly worth a visit and, if you're not only focussed on big stuff, you will nearly always find something new and special.
HTH,
Andy