[propbeanie]

Folks used to say that RFB was a "realism" mod, and TMO was a "difficulty" mod... I found both "difficult"... lol - TMO does have a more aggressive AI, which is to counter most players having read history, and realizing that the IJN ASW was weak at best in the early to mid-war period, so Ducimus upped the ante and made the AI like it should have been in real life. RFB though, makes the S-Boat basically a death trap below 200 foot, and not able to sustain much damage before failing, even at PD. The other boats are not much better at survivability. TMO does add to the campaign files though, for more variety, while RFB does not, so for me, Stock, RFB, TMO, and then FOTRS in degree of difficulty. FOTRS v2.0 is the only one to use for v1.4 of SH4, but is in German language only, and the reason it is more difficult than TMO is due to its use of the Multi-Player interface, which seems to make the escorts like ALL are set to Elite, but it is absolutely gorgeous, though it does have a few glitches. With RFB, you have to use v1.4 or lower. They numbered their mod after the version of the game, until after v1.5, when they did a few updates and used v2.x

btw, I don't think you'll find a disk version of the U-Boat Missions Add-On anymore, unless one pops up on eBay or somewhere similar. Ubisoft doesn't have the download version anymore either, unless you contact their support people, of which it can take several weeks to receive a response from them. They would probably charge you $10 for the Add-On, even if they do have it.