I just received my CS3 two weeks ago. This is my first foray in the realm of digital. I had already purchased a couple of MTS decoder locos and have been looking at various systems for quite a while including Massoth and ESU's ECoS. The fact that LGB (Marklin) was putting mfx decoders in their current stock limited my choices to the ECoS or CS3. I went with the CS3 primarily because it is a third generation digital controller with faster processing power, a lot of capability, and will communicate with MTS and DCC decoders in addition to mfx. I did want walk-around capability and am relying on the Marklin Mobile App running on an iPhone. At $10 the app is an inexpensive walk-around throttle, much less costly than a dedicated wireless controller. After all, just about everybody already has a smart phone. I have had WiFi in the house for years connecting laptops the the web so that was not an issue. Although I did have to install a LAN cable connection (Cat 5e) for the CS3 to connect with the wireless router which is in the basement.
The cost was $700 for the CS3 ($630) and a 3a Marklin 60065 power supply ($70). I wanted to purchase the 5a power supply but apparently there are some teething problems with the 110V versions sent to the US. The larger power supply will have to come later.
With the LAN cable fitted the CS3 connected to the Marklin site when first powered up and recognized that updates were available just as advertised. The system updated to the current software version without any problems.
At present I have just a single loop of track outside. Power is supplied by a 4 conductor 12 awg cable running from inside the house through an underground conduit to trackside. Only two of the conductors are used for track power. The other two are for future expansion or auxiliary power. The conduit also has room for additional conductors should the need arise. The inside connections are made with standard banana jacks in a low voltage wall box and banana plugs on the track cable form the CS3. The wiring spaghetti is minimal at only three cables - the power supply cable into the CS3, the LAN connection to a RJ45 wall jack located near the track power banana jacks that connects to the WiFi router and the track power cable to the banana jacks.. I'm assuming turnouts can be powered from the track for the time being. There may be s88 feedback sometime in my RR's future which will add complexity, but for now, the cabling is quite simple.
I was running a LGB 21393 Bernina Bahn ABe4/4 (MTS decoder without sound) with matching coaches this afternoon. The snow has temporarily disappeared although Winter temps at 0˚C today, are far from gone here in southeast Michigan. Once the gondola with 5005 track cleaner fitted had run a few circuits most everything worked fine with the CS3. The only problem was with the led coach lighting I'd just installed. It most definitely does need power buffering! The ABe4/4 railcar operated OK but some of the CVs will need tweeking. I need to figure that out. The Mobile App on my iPhone had no problem connecting wirelessly to the CS3 which is in the house. The iPhone app operates the MTS locomotive's speed control and its two functions (directional headlights and separately controlled interior lighting) just fine.
I have one much older LGB 2045 Ge4/2 that I just converted with an ESU Lokpilot XL V4.0 decoder. It too works fine with the CS3. It is self recognizing on the CS3 just like mfx decoder equipped locomotives.
The next Lokpilot XL conversion will be my 2040 crocodile now that the Ge4/2 has proven itself. The crocodile was what first attracted me to LGB and was the first locomotive I bought back in 1982. 35 years later it finally has the beginning of a permanent outdoor RR on which to strut its stuff!
I have not tried out the LGB 55025 turnout decoder with the CS3 yet. I'll be testing that out soon in preparation for expanding the RR this Spring/Summer.
Two weeks in and I'm pleased with the CS3 so far.