You're not alone. I kept a partition with 10049 to ensure the capability to upgrade to the next official build, but I also have 10056 in another partition. Both have bugs, of course, but my impression is that 10056 runs smother...All I did was to state a fact as I know it that build 10056 is the best build that I have used. I am not trying to impress you or anyone else and I certainly was not snarky. It is my opinion and only my opinion that Build 10056 is good as they get so far. I have not had any crashes as I did in 10049
I too would beware of leaked updates if I had to dual boot on same HDD but I have an old HDD just for that purpose and as I signed up for testing W10, testing is what I'm doing and that includes everything about W10 I can get my mitts on. I just take care when installing those (and official) updates by disconnecting other drives. If it doesn't work out I always keep .ISO from previous version, half an hour and I'm back where I stared from. Windows 8.1 and payed programs on it are just too precious to risk. One of my primary testing goals with W10 is testing hardware too so I gave up on VM for time being.
Play but play safe is my motto. Regular full W8.1 system backup with Reflect, helps a lot.
Right!I too would beware of leaked updates if I had to dual boot on same HDD but I have an old HDD just for that purpose and as I signed up for testing W10, testing is what I'm doing and that includes everything about W10 I can get my mitts on.
I also have a HDD exclusively for Windows 10 testing. Windows 8.1 is installed on a SSD.
I have separate disks for Windows 7 and Windows 10 builds. Both are WDblack1TB Spinners. I also have an old Seagate Barracuda and a Hitactchi drive laying around. Oh and everyone using any TP build is taking chances. That is why all of my important stuff is on Win 7.