I ran this with minor cosmetic modifications to suit my game and two players instead of one.
Thematically I quite enjoyed the adventure. A kidnapping, a search for the hidden lair and then the rescue, a classic set up. The story is easily transferrable between settings and locations. While I used the original swamp idea, I could see it being adapted easily enough with tweaks to the random encounter table. The hexmap exploration is an interesting aspect, however I ended up skipping it due to not wanting to hand out a map of the area to the players just yet and handling it without one would be difficult. Instead it was easy enough to give them a heading, roll up a couple of random encounters on the way and then set them at the hideout itself. And this makes it an easily adaptable, as you can alter things without losing the idea of the adventure.
The dungeon itself was nice, in my opinion. Perhaps a little too small for my two player party, but there is always an option to add extra rooms if needed. The base design, however, was solid and should prove enough for a lone character who has just survived the trek through the swamp. As for the enemies, I found that it offers a very similiar feel to FS1 Fortitude Dungeon when it comes to the encounters beyond the primary antagonists of the adventure and a player who had played that one did ask if this was from the same designer midplay. However, the primary antagonists feel a little too dangerous for a solo character to face against. Not only do they have a good chunk of hit points to spare, but there is also the threat of them being able to take out a non-warrior character out in one strike. While there are certainly room for clever players to maneuver into advantageous situations, the relatively high armor class and hit points make it a bit more of a dice game than is comfortable for level 1 characters.
Despite that, I found myself enjoying reading through the adventure and running it. It offers a fun, short dungeon crawl for a quicker session, especially if you forgo the exploration aspect. I would say that the adventure itself should provide a good 5-8 hours of fun in a fantasy world, depending on how swiftly the player(s) act. Overall a good, if challenging, module in the FS-series. Certainly a favourite that I will gladly reuse again at a later date.