I have both right now. I just upgraded to and recently installed the Type II with both the 5x7 and 8x10 VC heads. Until I have a chance to use it, all my experience is with the Type I. I'll probbly sell the Type I.
Under any circumstances, you need a compensating timer with the Type I. Even with this timer, there's only a single sensor, versus each color having it's own sensor. So, while you will always have consistent "overall" exposure, the contrast can vary as the individual green and blue colors vary.
The solution is to print each color separately, first one and then the other. This gives you one sensor, one light for each color. Assuming your timer is working correctly, this should give you consistency. I communicated with Richard Ritter by email, and he confirmed that this is the case. He also has the Type I.
As to sufficient light, I've had more than enough light with the Type I. The controller is so much heavier than the Type II controller, because the power sources are in the controller, and they are beefy. I've never had a problem printing 35mm to 8x10 in less than 30 seconds, and that's with the settings for both green and blue in the B to C range. That's in the low range.
The main problem with the Type I is that it's no longer possible to obtain replacement lamps with. That's why I took the opportunity to purchase a Type II. Another problem is that it won't print 5x7. It was originally designed as an oversized 4x5. It's vague as to how it obtained the 5x7 label.
I don't know if the one you're looking at has the Beseler adaptor, but that's an good accessory to have with this enlarger. For example, I easily adapted my D2v condensor head to the Type I. It was trivial. I placed a 1/4"x1/2" piece of rubber around the circumference of the condensor head at the correct height.
There are no replacement lensboards and negative carriers available, except perhaps the 9cmx12cm, and maybe one other obscure sized carrier.
Another thing to keep in mind about the Type I is that it's easy to adapt the Type II 8x10 head to this enlarger. Takes three small screws that I purchased from a hardward store. I also used three small rubber washers. But, using the 8x10 head with this enlarger places limitations on the enlarging lens that cn be used. About the only one I found that would fit is a an older 240 Schneider Componon.