Strengths: Well, I went for the 631 tubed Sirius in blingy titanium colour. It looks superb and the welds are amazing. Really impressed with the quality of the frame, and the service from Stuart. I've gone for 08 coil Revelations to give some flexability to wind up or down depending on the terrain. Formular Ora K18's, XT kit, Bel Air Saddle, Smica layback post, EA50 bars and stem - 90mm o/s.
Weaknesses: Hard to say until I've ridden it. It's currently at the LBS getting the BB installed and the rear disc mount faced. Just a week to wait!
Overall: Just goes to show, you don't need to spend mega bucks to get a decent frame.
Strengths: Price, Colours, Good communication from Pipedream, adjusted geometry for 130mm forks.
Weaknesses: Not a 'branded' steel (but at this price what do you expect)
Overall: I have the blue colour but i really wanted the red one but they didnt have any in stock and weren't expecting another delivery for some time. When it turned up I was really happy with the colour and wouldnt have the red one now if it was offered to me. The build quality is great for this price of frame. I've built mine up with Revalations, Juicy 7s, Mavic Crossride wheels and FSA finishing kit. Really happy with the ride and even though it isn't a branded tubeset it is still steel so you still get that zip that you get with some of the more expensive tubes (853 for example).
Really happy with it so far and when i feel like a change of frame, this one will become the SS and the current alu ss frame will be decomissioned. I deliberated for months over which frame to get and i am so happy with this one, i dont know what i was doing wasting time.
mine can be seen here: http://www.flickr.com/photos/richardmcbrayne/sets/72157603428324640/
Strengths: Cheap, great range of colours and a really sweet bike to ride.
Weaknesses: Only one bottle holder
Overall: I built my Sirius last May with a pair of RockShox Pyslo Race forks and Shimano Deore disk brakes. It is a great bike to ride and when I bought a full bouncer I could not bring my self to sell the Sirius so I have kept it for muddy & shorter rides! Oh, and towing my son in his bike trailer or my daughter on her Tag-a-long.
Strengths: The new titanium version is very light, beautifully made with smooth welds and well placed cable guides. It is laterally stiff and vertically compliant. The bike acclerates with the super efficient pedalling of a road bike and climbs superbly. I found it much better matched to a 100-130 Rockshox revelation than my previous 80-100 Marzocchi. The Rockshox make descending more certain and climbing remains excellent with the front wheel staying on the ground. Corners are carved to perfection. Customer service is second to none, they definitely go the extra mile. After telephone discussion about your requirements, drawings arrive so you can be sure of the geometry and measurements, all of which were accurate. Extra bottle mounts, tweaks to the dimensions can all be done. The frame builds up without problems and is a joy to ride.
Weaknesses: none
Overall: A beautifully made titanium frame for £699 with 1st class customer service and superb geometry for a 130mm fork. Unbeatable!
Strengths: Price Tyre clearance up to 2.5" Colour choice Build quality Customer service (Sent out without even paying for it) 5yr guarentee Havent had this frame very long so will update at a later date. The above are the quick observations. From the first big ride i did on it i found that anything below 115mm fork was too low for me on technical decents. Once i dialled out to 120-130mm (110mm sagged) the bike could decend the rocky stuff as well as any other bike i have ridden. Other than that the only comments i have are that the 18" is for 5.9" and above cos standover for me is borderline <1" however top tube seems to be just right for XC use.
Weaknesses: Seat clamp size makes it very difficult to get. On One are the only company i could find who do them