Once you're on the feathers you won't use anything else.
I've been working through my SuperMax (India) 10 blades. Being the first DE blades I have got used to them, I get about 3-4 shaves but only 1-2 shaves seem to be pristine cuts and require against the grain to get really close. With this razor I found that a Boots sold shaving gel (B men of something like that) worked best with a good glide and no irritation (unlike W/S soap with the same) but for the last two weeks it's been a W/S soap in a pot..
I received the well packaged set, so I now have enough for the next two years:
5 Treet Platinum (Pakistan)
5 Gillette Silver Blue (USA)
5 Gillette Platinum (Russia)
5 Gillette 7'oclock sharp edge (Russia)
5 Astra Superior Platinum (UK, made by Gillette)
5 Big Ben Super stainless
10 Persona Platinum
10 Super Plus Platinum (Israel)
10 Derby Extra Stainless
10 Wilkinson Sword (black pack)
10 Muhle Stainless
30 Feather Hi-Stainless Platinum
Tried a Feather this morning. Using the same W/S soap and EJ brush. Hard to describe but felt very different, cut through the 4 days of growth really well, no need to go against the grain to get a very close cut. With the W/S soap - no irritation.
Initial impression better than the SuperMax with fresh blade cuts. Will see how the next cuts go.