Hi, I've been lurking and learning for a while, but thought I'd finally contribute as I have 1st hand experience...
I bought from CamperKings a converted T30 150 Highline LWB in Sept18. I don't have the time to do do a full self install and opted for a route that got me a suitable van quickly and with some degree of warranty if something goes tits up. I did a fair amount of research and looked at quite a few conversions - but for me I could not separate many of the converters I looked at for the same sort of money (looked at likes of Danbury, Bilbo's, few localish guys) so it came down to design and what I thought would suit my use best and they just landed in front.
So far I've been really happy with the van and have used it on about 10 weekend trips since Sept and have had no issues - its even warm on a cold night with the heater ticking over! One bug bear was the cheapo Chinese tyres fitted to the 20" rims - 2 are not actually round so its like having your balancing permanently out; local fitter managed to get them much better with a not insubstantial lead contribution, but I'll swap out soon for some proper rubber when I can; but I had other things to do first - my priority after driving it (slowly!) through he dark winter was to save up so I could swap out the shite VW H4's for a set of OEM H7 units with uprated bulbs; did this a few weeks back and the difference is well worth the ££ and not difficult effort to change them (bought the H7's on eBay). I've then gone on to add side bars, put in the VanKraft dual passenger seat folding bracket (well worth it if only because Mrs C is more comfortable on a journey).
Now counting pennies to buy B14's and H&R ARB's and a solar kit.
I won't recommend these guys or not as I've only directly experienced them so have no context and any feedback I have is only based on my van; it may be different if you get a 'Friday' conversion! All I can say is that I'm not unhappy with the investment I made and nothing is poorly finished or falling apart yet after regular use; but like anything the choice, once made and committed to is what you have to live with so do your research.