Two major areas of concern functionality wise and one of resource usage in addition to the questionable choice of flash as the client:
1). Unacceptably slow.
2). No real time updates (this is a HUGE step backwards as compared to the original client).
3). Unacceptable resource consumption. By this I mean that it must be installed either as a virtual appliance, or in your own server VM. Either way it uses gigabytes of storage and a dozen megabytes of memory. For all practical purposes one might as well consider the overhead of this approach as overhead required by the hypervisor itself, because you can't manage ESXi properly anymore without it. For those of us using an essentials package this overhead represents a significant fraction of the total computing resource we wish to make more efficient use of by purchasing VMWare in the first place. At least before we could choose to manage the machines individually with the native client and not incur any overhead, which is practical in a small shop where essentials would be used and funds are often very tight. Now, we basically have no choice.
