My first purchase was the TS75.
I had been using the EZ Smart rails on a Porter Cable 325mag with pretty good results; but the dust collection was lacking and I liked my PC free of the base for framing and rough use.
I didn't fall in love with the 75, and actually returned it within a week. I got the TS55 and have loved it ever since. I initially used it with a Ridgid w/d and a Mr. Nozzle hose. It worked quite well.
As you all know, it doesn't take long to add to the madness. I got very lucky on a used deal to get a ct22 and an OF 1000, but the router doesn't have the rail stops, steel bars, or edge guide. I also picked up an MFT1080 on closeout. I paid retail for a ETS 150/5, and it hasn't hurt my feelings a bit.
I'm torn over what is next. Most likely the Domino, but I keep eyeing the OF 1400.
I like my OF 1000, but without the rails stops and bars, it really only sees roundover and edge trim duty. In that regard, it isn't much handier than my Bosch kits. OTOH, I could easily see the OF 1400 used with the tracks getting me off the table saw for dado and rabbet cuts.
Then the Domino.... I could see it changing the way I do a lot of things: from traditional mortise and tennon joinery to reducing, and in part replacing, pocket hole screws. Heck, I can think of two projects I gotta get done before the end off summer that I could finish in literally 1/4 the time with a Domino.