Al-Allaamah Rabee Bin Haadee al-Madkhali (may Allaah preserve him and prolong his life upon goodness) stated about Al-Allaamah Muhammad Amaan Al-Jaami (rahimahullaah):

Indeed those youth who ridicule him!; By Allaah I have not tasted the sweetness of the Aqeedah, particularly Tawheed Al-Asmaa Was-Sifaat, except through this man Shaikh Muhammad Amaan.  By Allaah he knows it and is excellent in its exposition.  And by Allaah had all those who ridicule him studied under him, it would have been a noble and honourable (thing) for them.  By Allaah I have not seen anyone more suitable in teaching the Aqeedah and presenting it similar to this man.  I have met those more knowledgeable and greater than him, but with regards to exposition of the (Aqeedah), by Allaah I have not seen the likes of him.  This man is great and well-grounded in Aqeedah; (but) those people ridicule him.

[Source: http://www.sahab.net/forums/index.php?showtopic=133948]