Dell has a history of doing a weird/terrible job at merging in company acquisitions. I'm looking at you Compellant/Equalogic, Wyse, Force10. I suspect EMC is going to be another one of those standalone assets for some time just because at the scale EMC operates, the contractual obligations to their large customers is going to make change slow.
Looking at the storage assets alone, it's a bit strange to merge 3 competing companies together when they really havn't merged the first 2 after several years. The general vibe I've gotten from other peers is to stay away from Dell Storage with a 10ft pole, but EMC hardware was pretty good for traditional storage. When looking at the EMC storage products it's relevant to note the significant differences under the hood when it comes to VNX/VMAX/Isilon coming from the old Data General acquisition in 1999 and the new XtremIO arrays which was a totally different company until 2012.
I do look forward to them eventually gutting whatever hair-brained system manages their support system. After years of working with EMC, I'm fleeing not because they make a poor product or a person does a poor job. Rather, it's because their SR management system is horrible. I shouldn't have to keep my support district manager's cell phone handy when they decide to route my SR into oblivion. I've worked with Dell for a long time as well and at least I can generally talk to a knowledgable human being without have to go through a checklist first.
From a customer account perspective I'm also hopeful. I've had my account rep change 3 times in 2 years; none of which have actually made the trip across the US to see us face-to-face. On the other hand, recently Dell has made several relationship improvements. I actually see my dell rep and his engineer 2-3 times a year. This makes a huge difference in my opinion on the sales/account team.
As a VMware customer as well, I don't see a significant difference in what will happen. EMC has generally been hands off when it comes to steering VMware. The only real advantage I've seen them take with their ownership is getting to be the first out of the gate with new VMware features, but it's not locking others out. If EMC was to take a strong hand in steering the VMware ship VSAN would never have seen the light of day and vVols would be an EMC exclusive. Likewise form VMware's perspective EVO:RAIL wouldn't have allowed any other partners to produce solutions if they weren't trying to be neutral.
I'm hoping that Dell doesn't cannibalize or kill of the EMC Twinstrata acquisition. It will also be interesting to see what Dell does with some of the other EMC assets like RSA, Pivotal, Avamar, Data Domain, the plethora of hosting solutions, Greenplum, Mozy, Watch4Net, & Iomega.