I have an Omnia 7. It does occasionally crash, but I've never had a problem with apps being unusable on the phone, though the Bluetooth issue is a pain (I believe Samsung Focus handsets in the US have had a mini software update to fix the Bluetooth problem, so hopefully we'll get the same one here).
Despite that, I'm still glad I bought it over the HD7. The screen is better, the battery life's a lot better, the build is superior (mostly metal compared with the plastic HTC handset) and the camera is better quality too.
I'm sure once the update's all come through over the coming months, the handset will rival any out there. Even as it currently is, I'd still say it's one of the top half-dozen handsets on the market.