Some potential buyers may be put off by some of the low reviews and discussion of bugs. Most of the bugs have been fixed, multiplayer works fine, and the game is just as fun as you remember. This GOG version includes the original as well, so if you are a purist you can just ignore the EE and play the regular one.
I'll admit the new content from EE does seem at least slightly different than the content in the base games, but not such that it detracts from the game. I've been using the Big World mod kit with BG1EE, SoD, and BG2EE for the full trilogy experience. I haven't tried SoD yet and am a little apprehensive about some of the reviews, but even if it is awful, the fact that I can make a level 1 character in Baldur's Gate and get merked by a single wolf, and then seamlessly play that character all the way to demigod power levels in ToB is a huge selling point for me.
This is currently on sale for $6.66, and at that price this is an excellent deal. At $19.99, I'd probably wait for it to go on sale, but I'm also a poor college student >.>
Also, some people's reviews complain about broken mod compatibility. As of March 2017, most mods work with the enhanced editions. I am playing with the BG1 NPC mod pack for the first time and am absolutely loving all the added banters! I've encountered a few minor hiccups, such as one of Imoen's banters playing several times in a row, but I think that was because the particular banter creates an item and her inventory was full the first several times it happened. Regardless, these minor issues are hardly noteworthy in what is one of the most enjoyable gaming experiences of my life.
Strongly recommend.