Does anyone actually have any Draytek Vigor product working reliably and performing well?

I've pretty much lost all faith in the products from recent experience:

site A supplied with two V120 modems (one V1 one V2) both of which drop about 15% packets (ended up replacing with the free ISP zyxcel router).

site B with a Vigor 2830 that needs rebooting multiple times a week.

Site C with Draytek 2850 (set to auto reboot daily) still degrades performance over the course of the day to a snails pace. replaced with free router from ISP.

Site D Draytek vigor 2850 on BT infinity service - throughput performance is 20% slower than with free BT hub.

Site E two new Draytek 2830ns - no sync on to ADSL with either one - reverted to free isp router.

Site F draytek 2830 required rebooting several times per week as no connection - replaced with cheap alternative......

I've spent hours if not days with each site upgrading / downgrading firmware and factory resetting devices.

On paper the features look great for the devices but I don't think I have a single Draytek device in service that actually does what it's supposed to reliably. I appreciate that they aren't the most costly devices on the market, but they are also a long way from the cheapest - either way they should still "do what they say on the tin".

Does everyone else have this much trouble with them generally or am i just a special case?

Draytek 2820n - Rock solid. Had it for 5 years, haven't noticed a single issue with stability in all the time I've had it

Have a client with a 2830 on a really crap line and it seems to do OK.

Wonder if its a configuration setting you are using which is in common to all those sites? VPN? Firewall? Etc?

Not that i can think of or see. They are unrelated sites in geographically different areas using different configs. Mostly just straight forward ADSL internet config, with a couple of port forwards, a couple are using site-to-site VPNs, two are VPNing back in to the Draytek (one SSL one L2TP). Some have Wifi, some don't.

In fact the V120 s are completely different devices (pretty much a dumb modem, although you can manage it somewhat), but they seemed to be pretty much unusable.

Your 2820n - that just sits there and works from one week to the next without rebooting it??

Yes I can't remember a single time where it has rebooted itself or gone iffy. The uptime always as expected (i.e., since I last rebooted it or there was a power interruption).

I wonder if it's the VPN functionality.... ?

I think from reading the forums its clear Draytek do have a weakness with configurations getting corrupt on them, as well as the occasional unsupported configurations which it is possible to make. I wonder if it is worth upgrading one of them with the latest firmware using the .RST to clear all settings, and then reconfiguring from scratch in a clean manner, and see if there is any difference..

using the rst and applying setting manual sorted my issues with my Vigor130 , a good way to try