How are the fair and flawless products?
answer: they work
Is the skin soho line better then the old stuff?
NO. more or less its the same stuff packaged differently. look at the ingredients list to compare.
Can it lighten the skin 3-4 shades?
maybe. depends on your regimine, skin type and thickness.
Is it permanent?
NO, nothing is. you can maintain with peels, sunscreen and vitamin c (dont continue taking the arbutin or stepiwhite products). but once you stop and you go outside in the sun your skin will be photosensitive and will try to aggressivly reapply pigment. so you will have to wear sunscreen, maybe, avoid the sun, carry around a UV protective umbrella and wear UV protective clothing. it will probably be alot more work to maintain then it is to achieve skin lightening.
here is one question you didnt ask. can stuff go wrong with products containing arbutin?
YES, this stuff is extracted and is considered the "natural" form or HQ. its less harsh but it can cause simular side effects like skin darkening. many people on skin lighening forums have make this remark. but the problem is not that the HQ or arbutin its actually the reaction your skin gives to light. if your skin's defense is being compromized then your body will try its best to counteract it. you want to be light but you are safer from the sun when you are dark. also your skin is probably going to be a bit thin from the peels (which also aggreivate photosensivtity as well as help boost the lightening power of skin lighteners) so with all that going against your body the easiest thing for it to do is make more pigment which can sometimes take your to a darker shade then when you were originally. im trying to research some ways to reduce photosensitivity and increase skin thickness which will protect against skin damage from the sun and can reduce the bad side effect of skin lightening. so stay tuned.