Hi Dainius,
I had ordered from SOS as well...about 2 years ago or something like that. I found the price to be much higher than your average D'Addario, Dean Markley, Ernie Ball, etc...If I remember correctly, I paid about $12 per pack. I did receive them relatively quick, within a couple of weeks. I found that they had a nice feel, felt looser than my usual brand of strings but I did break the high E or G string (don't remember which one) on 2 or 3 of the packs that I bought. Just for reference, I never break strings.
The fact that you don't need to change them often is not really an advantage since my strings normally last me 6 months before I need to change them anyway. Then again, I don't play shows on a weekly basis either.
Bluesbuster (Ted) had sent me a couple of sets of the DR Blues when I purchased a pickguard from him (what a dude! )and they played exactly like the SOS, without the strings breaking and without the ridiculous wait that people are experiencing.
Way too many good options and fantastic service out there before considering a jerk-off like Dean.
Nick