No, it's not cheaper because if you live in a rural areal you have to get the kit sent by mail too, which costs exactly as get the film from a lab.
It's definetly better and cheaper (quality-wise), imho, to send the film to a lab.
@AgX: there's no play room when it gets to E6 processing, that is no fun involved, unlike b&w negative processing.
Alessandro, I respectfully disagree, as my experience (and I routinely home process E6 !) is totally the opposite !
I stop sending my film to so-called "pro" labs, years ago. I was charged when sending my film by mail (as a parcel, not a letter ), was charged for the processing, and charged again for having my slides back (again as a small packet, not a letter). And the resulting slides was.... just ugly ! Badly mounted slides, dust and specks (after drying, obviously...), and sometime muddy colors... My home processed slides, with 5L and now 2,5L Tetenal kits, are a lot better, and in all case, if any rare defect, I'm the only one to blame. All of this with my 30 years+ Jobo ATL 1 processor (carefully self repaired and grossely calibrated...)
I now use for the first time 2,5L kit, after using 5L kits for long, and it yields 30x 135 films. This 2,5L kit is now 65€ (see nordfoto webshop), so a little more than 2€ a 135 or 120 roll. Of course, this is not going cheaper, as not so long ago, 65/70€ was the price of the 5L kit (can process 60 films...)
I am agree that this one-shot kit is rather a steal, and probably not a smart move from Tetenal, unless they want to sparkle interest to the young and unexperienced with a one-try E6 processing. Re-Introducing the 1L kit would be a lot more interesting for us.
I should talk also about MF and LF films : I can process 120 sheets of 4x5" large format slides with one kit ! Last time I checked (years ago), pro labs asked 5€ for processing.... ONE sheet !
BTW I just begin a "batch" of E6 dev, yesterday night, and here is a glance at the result from the first film (Provia 100F)
Slides are IRL a lot more nicer, vivid and accurate on the light table than this quick digicam shot (quick WB adjustement).
Best regards,
Raphael