How stable is 10.11?

It's still a DevPrev - so some bugs and glitches are to be expected. Don't install it, if you rely on some stuff and couldn't afford bugs for your daily work. Why don't you just install it on a second HDD or partition?

I thought about it, and I knew this might work. I just wanted to get a sense of other people's experience before going ahead and doing a major reorg. I am okay with few minor glitches once in a few days, and would like to know whether beta 1 is usable ? Is there a page listing major bugs and reasons for crash down? Also would Apple maintain the two week schedule for releasing new betas, like last year? Thanks..

I found this page to be very useful: https://developer.apple.com/library/prerelease/mac/releasenotes/General/rn-osx-10.11/index.html#//apple_ref/doc/uid/TP40016209-CH1-DontLinkElementID_4 As you might expect :)..

OK, here my experience:

- I had several Kernel Panics in the beginning (twice or thrice)

- CardDAV / Contacts is completely broken after Clean Install

- Airport crashes from time to time

- iCloud is hanging several times a day

- some third-party stuff is not working due to the new system integrity protection

- Upgrade will remove some files installed by third party apps ( mostly in /usr and other directories that are now supposed to be system-only )

- some processes will crash - I had Spotlight, Locations, WindowServer e.g.

But actually my overall experience says, it is far better on my systems than Yosemite DevPrev1 ever was.

It's stable as long as you reboot it each day. Throws a lot of errors but the system seems to mush through and work. I've got a 2015 MBP 15" high-end model and it runs it fine. You'll have to watch out for run away processes and make sure you have a power cord nearby. Overall though, same as others, it is stable.

Thank you lefrax0412 and bradhs, appreciate your time to note this down for me.

100% stable on my side, but there are massive bugs in MAIL and some other parts are not working proper.

Example: screenshot is not working 100% (just 5 min ago that I saw that) :-)

i have a mac book pro with this confi below,want to find out if the OSX 10.11 will Run fine on my system and i will not have the display graphics card switching issues that ocor in 10.10.2.

Model Name: MacBook Pro

Model Identifier: MacBookPro11,3

Processor Name: Intel Core i7

Processor Speed: 2.3 GHz

Number of Processors: 1

Total Number of Cores: 4

L2 Cache (per Core): 256 KB

L3 Cache: 6 MB

Memory: 16 GB

Chipset Model: NVIDIA GeForce GT 750M

Type: GPU

Bus: PCIe

PCIe Lane Width: x8

VRAM (Total): 2048 MB

Vendor: NVIDIA (0x10de)

I only experienced graphics issues on HDMI displays - but my configs are pretty different from yours.

2 * MacBook Pro 7,1 - NVIDIA GeForce 320M - 8GB RAM

1 * MacMini 8,1 - Intel HD Graphics 4000 - 16GB RAM - the one connected to an HDMI display

You can't submit apps you build with the beta SDKs (TestFlight is okay), you won't be able to release until the fall when both OSes are close to the release date.

I'd suggest installing El Cap as a separate partition on your drive or use a fast external drive if you need to test El Cap. Keep in mind if you're upgrading watchOS to 2, you will have a very difficult time to downgrade to watchOS 1, so again, not recommended unless you're sure you can wait until the fall.

As for my experience, it's 98% stable, there are glitches with Safari, CardDAV, Mail, and so on. All of which were filed as radars and Apple's aware of it.

You also have the option of waiting for the public beta, which should be fairly stable compared to developer betas and released less often.

Thank you for sharing your experience.

Thank you for your detailed notes and useful pointers, very helpful for a new developer like me.

The first beta release of El Capitan has so far been the most unstable version of OS X I've ever seen. Far worse on my system (2009 MacBook Pro) than Yosemite. It locks up hard just about once a day, and I have no idea what is locking it up. Graphics corruption in various places, mostly seen in Safari, embedded videos and such.

I really wouldn't recommend any early beta versions of OS X to anyone that only has one machine available or anyone that doesn't have multiple full backups to restore from.

That's my 2 cents so far. Hopefully all my crashing is helping Apple find some of the bugs.

Thank you RedBear for your comments.