like you, when I got the machine I bought a load of caps to try, but as time has gone on, the only ones I continue to use regularly are the ones for "Wool" and "Ultra Dark" - I find they are pretty good, but I do agree are quite an expensive option - but I keep buying them! Its the wool ones that are used most frequently for jumpers etc, and Ultra Dark I only would use for Jeans, matched with the Denim cycle.
I have just finished the booster caps too - I won't buy those again though, because whilst they're excellent, I can just add Vanish powder to the machine when I am washing tea towels, etc for about 1/4 of the price. Interestingly, the machine dispensed this about 1/2 way through the main wash rather than at the start. Guess thats why with these you ned to select additive rather than detergent on the Cap menu
I have got the Outdoor Caps which I have used once for our outdoor jackets, to make the most of the Proofing Cycle. These are absolutely excellent but as I mentioned, only used them the once so far, because you don't need to wash your jackets very often....
I had the fabric softener capsules and they were absolutely dreadful - the scents weren't very nice (in my opinion, anyway) and it felt like they needed to be more concentrated to be honest. Full loads of towels, bedding for example wouldn't be soft like they'd be with a normal style softener - the drier didn't help too much. So, needless to say I won't buy those again
On the subject of fabric softener, I found it frustrating that once you stick a cap in (say, for example, Ultra Dark) then by default you can't use softener too. To get around this, I wait for the initial fill then take the capsule out, and fill the compartment as normal with softener and the machine dispenses as normal in the final rinse.
I also continue to use the Miele Twin Dos cartridges, and I've noticed they've started to roll out different formulations for these - going to order some of the "Refresh Elixr" to give them a go - just one of each rather than a case, just in case I am stuck with a set of 6 that I dont like! Stuck a link in for those interested.
Buy genuine Miele UltraPhase and new UltraPhase Sensitive detergents for Miele TwinDos washing machines. UltraPhase detergents are designed to work perfectly with Miele washing machines and dispense the perfect amount for each wash load. Free and fast delivery on orders over £15.
www.miele.co.uk