I installed windows 10 (32bit) last night alongside XP and 7. The installation went smootly and only took 16 minutes from the option to boot from the disc to the first appearance of the desktop. My PC is not the most modern running a Core 2 Duo E8400 with 2gb Ram and an ATI HD3450 video card.
I was surprised that all except one driver is included in windows. That one missing driver gives rise to a big BUT. At present there is no driver from windows update or ASUS. The driver is needed for my Asus D2X soundcard. The only sound I have at the moment is from the HDMI output of the video card but as you are aware speakers built into a monitor are generally crap to say the least. Windows 8:1 drivers dont work either
First impressions are very promising especially the return of the start button. In my opinion its a cross between the original windows 8, windows 8:1 update 1 and windows 7 all rolled into one.
If you asked me if i would upgrade to W10 I would say yes BUT only if a driver for my soundcard becomes available.
I will be keeping a very close eye open for the appearance of a soundcard driver between now and April 2015.
Between now and then i will be testing various different software that i normally use.