+1 for a full featured web app or windows client on a par with the Mac version.
Sadly I'm now working in a windows only environment where BYOD is pretty much forbidden. This is jarring after my previous job where having my Macbook pro on the network was fine.
I've tried using the iOS version but pasting clips and urls back and forth between OF and whatever else I'm doing is central to how I work. The iOS version is great when I'm out and about but no replacement for something on the desktop.
I've trialled spootnik but it has very limited features that don't align well with how I use Omnifocus (no perspectives, task notes, project focus or date editing).
I even considered renting a virtual Mac so I could RDP to a remote desktop running OF, but that gets pricey fast. Most companies want $25 a month and that's for an underpowered machine or with a limited number of hours per day connection time.
I've finally opted for a todoist pro account which is about $20/year (but also has a free tier). It's actually pretty good and compares well with OF. Its gathering features and integrations with other services at quite a clip but most importantly has clients that run on pretty much everything and a web service.
But I'd still rather be pushing that money in Omni's direction.