UCS Firmware-2.#(##)-should I or wait ... or ...

Hi, Cisco:
I have heard a lot of horror stories after UPGRADING to Cisco UCS 2.#(##).
My customer is running 1.4(2B) and I have to perform an upgrade, so I am pondering SHOULD I upgrade to 1.4(3#) or 2.#(##). It is a production environment. SAN Booting, UCS M81KR, ESX 4.1i, etc.
i want to hear some candid feedbacks from Cisco or others.
Thanks.
SiM

SiM, the IO module firmware version must always match the connected Fabric Interconnect version. The software forces this version consistency. It works just like the Nexus 5000/7000 and Nexus 2000 (FEX) relationship, a FEX will always match the version of firmware that is on the parent switch.
If you were to not leave the "set startup version" box checked on the IOM activation and reset it the IOM would reboot and then its firmware would get reset back to the version running on the FI. Then when the FI activation is performed it would also update all the conected IOM to the same version and reboot them. So there is no way around having to do it the documented way.
The way that you are propossing would actually cause more downtime because the IOM would reboot twice.
Have you read through this guide? -
http://www.cisco.com/en/US/docs/unified_computing/ucs/sw/upgrading/from1.4/to2.0/b_UpgradingCiscoUCSFrom1.4To2.0.html
In this section it talks about the IOM activation and how it must match the FI version -
http://www.cisco.com/en/US/docs/unified_computing/ucs/sw/upgrading/from1.4/to2.0/UpgradingCiscoUCSFrom1.4To2.0_chapter4.html#task_F0C09BC50D2048A1B0C495F7F6E6093A
It states:
"Important:
When you configure Set Startup Version Only for an I/O module, the I/O module is rebooted when the fabric interconnect in its data path is rebooted. If you do not configure Set Startup Version Only for an I/O module, the I/O module reboots and disrupts traffic. In addition, if Cisco UCS Manager detects a protocol and firmware version mismatch between the fabric interconnect and the I/O module, Cisco UCS Manager automatically updates the I/O module with the firmware version that matches the firmware in the fabric interconnect and then activates the firmware and reboots the I/O module again."
On your northbound L2/L3 switch "spanning-tree portfast trunk" for Catalyst or "spanning-tree port type edge trunk" for Nexus should be configured on the interfaces and port-channel interfaces.
As long as you folllow the upgrade guide and have all Service Profiles configured with vNICs/vHBAs in both Fabrics and have a user-acknowledged maintenance policy configured you shouln't have any noticable downtime.

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